Add missing MSVS project XML file paths to .gitignore.

As of #298318, "git status" reports these untracked files.
(GYP generates these for MSVS project schema definitions)
Add the file paths to .gitignore, like others, for sanity.

I found the following .xml entries with no associated GYP target:
  /chrome/tab_capture_performance_tests_run.xml
    (legit: tools/build/scripts/master/factory/chromium_commands.py)
  /ppapi/native_client/src/shared/ppapi_proxy/nacl_ppapi_browser.xml
    (seems stale, but gab added in r126724 for building all.sln)
  /ppapi/native_client/src/shared/ppapi_proxy/ppruntime_lib.xml
    (seems stale, but gab added in r126724 for building all.sln)
  /remoting/proto/trace_proto_lib.xml
    (seems stale, but referenced in tools/emacs/trybot-mac.txt)
  /remoting/remoting_host_installation_unittest.xml
    (seems stale, no other mention; alexeypa added in r135217)
  /tools/metrics/histograms/histograms.before.pretty-print.xml
    (legit: tools/metrics/histograms/pretty_print.py)
I removed the entries for the middle four apparently stale paths.

BUG=NONE
TEST=Cleaner "git status" on Windows machines.
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/637643002

Cr-Commit-Position: refs/heads/master@{#298578}

.gitignore

@@ -44,6 +44,7 @@ v8.log
 /_out
 /android_emulator_sdk
 /arm-sysroot
+/ash/ash_unittests_run.xml
 /base/base_unittests_run.xml
 /breakpad/src/
 /build/Debug
@@ -131,20 +132,29 @@ v8.log
 /chrome/tools/memory
 /chrome/tools/test/reference_build
 /chrome/unit_tests_run.xml
+/chrome/web_ui_mojo_bindings.xml
 /chrome_elf/chrome_elf_resources.xml
 /cloud_print/cloud_print_version_resources.xml
 /components/chrome_settings_proto_generated_compile.xml
 /components/cloud_policy_proto_generated_compile.xml
+/components/gcm_driver.xml
+/components/leveldb_proto_test_support.xml
 /components/rappor.xml
 /components/search_engines/prepopulated_engines.xml
+/components/suggestions.xml
 /components/variations.xml
+/content/browser/service_worker/proto.xml
+/content/content_browsertests_run.xml
+/content/content_common_mojo_bindings.xml
 /content/content_unittests_run.xml
 /content/test/data/gpu/generated/
 /content/test/data/gpu/gpu_reference/
 /content/test/data/layout_tests/
 /content/test/data/plugin/
+/content/web_ui_test_mojo_bindings.xml
 /data
 /delegate_execute
+/device/serial/device_serial_mojo.xml
 /google_apis/gcm/gcm.xml
 /google_apis/internal
 /googleurl
@@ -154,44 +164,69 @@ v8.log
 /media/cast/logging/cast_logging_proto_lib.xml
 /media/cdm/ppapi/api
 /media/media_asm.xml
+/media/media_mojo_bindings.xml
 /media/test/data/content
 /media/test/data/security
 /media/yuv_convert_simd_x86.xml
 /metro_driver
 /mojo/hello_world_service.xml
+/mojo/mojo_application_bindings.xml
 /mojo/mojo_application_manager_unittests.xml
+/mojo/mojo_apps_js_bindings.xml
+/mojo/mojo_apps_js_unittests_run.xml
+/mojo/mojo_clipboard_bindings.xml
+/mojo/mojo_content_handler_bindings.xml
+/mojo/mojo_core_window_manager_bindings.xml
+/mojo/mojo_echo_service_bindings.xml
+/mojo/mojo_example_service_bindings.xml
+/mojo/mojo_external_service_bindings.xml
+/mojo/mojo_geometry_bindings.xml
 /mojo/mojo_gles2_bindings.xml
+/mojo/mojo_gpu_bindings.xml
+/mojo/mojo_input_events_bindings.xml
+/mojo/mojo_js_unittests_run.xml
+/mojo/mojo_keyboard_bindings.xml
 /mojo/mojo_launcher_bindings.xml
+/mojo/mojo_media_viewer_bindings.xml
 /mojo/mojo_native_viewport_bindings.xml
+/mojo/mojo_navigation_bindings.xml
+/mojo/mojo_network_bindings.xml
 /mojo/mojo_public_bindings_unittests.xml
+/mojo/mojo_public_test_interfaces.xml
 /mojo/mojo_public_unittests.xml
 /mojo/mojo_sample_service.xml
 /mojo/mojo_shell_bindings.xml
+/mojo/mojo_shell_lib.xml
+/mojo/mojo_spy.xml
+/mojo/mojo_surface_id_bindings.xml
+/mojo/mojo_surfaces_app_bindings.xml
+/mojo/mojo_surfaces_bindings.xml
+/mojo/mojo_test_service_bindings.xml
 /mojo/mojo_view_manager_bindings.xml
+/mojo/mojo_window_manager_bindings.xml
+/mojo/mojo_wm_flow_embeddee_bindings.xml
+/mojo/mojo_wm_flow_embedder_bindings.xml
 /mojo/mojom_test.xml
 /mojo/sample_service.xml
 /native_client
 /net/Debug
+/net/net_derived_sources.xml
 /net/net_unittests_run.xml
 /net/Release
 /net/testserver.log
 /out
 /out_*
 /ppapi/native_client/nacl_irt.xml
 /ppapi/native_client/ppapi_lib.xml
-/ppapi/native_client/src/shared/ppapi_proxy/nacl_ppapi_browser.xml
-/ppapi/native_client/src/shared/ppapi_proxy/ppruntime_lib.xml
 /ppapi/native_client/src/trusted/plugin/ppGoogleNaClPluginChrome.xml
 /remoting/appengine/
 /remoting/host/installer/linux/internal/
 /remoting/proto/chromotocol_proto_lib.xml
-/remoting/proto/trace_proto_lib.xml
 /remoting/remoting_core_resources.xml
 /remoting/remoting_elevated_controller.xml
 /remoting/remoting_host.xml
 /remoting/remoting_host_event_logger.xml
 /remoting/remoting_host_installation.xml
-/remoting/remoting_host_installation_unittest.xml
 /remoting/remoting_host_messages.xml
 /remoting/remoting_infoplist_strings.xml
 /remoting/remoting_lib_idl.xml
@@ -205,6 +240,7 @@ v8.log
 /sdch/open-vcdiff
 /seccompsandbox
 /skia/tools/clusterfuzz-data/
+/sql/sql_unittests_run.xml
 /sync/sync.xml
 /sync_testserver.log
 /testing/gmock
@@ -378,6 +414,7 @@ v8.log
 /tools/win/link_limiter/build
 /ui/surface/surface.xml
 /ui/surface/surface_gpu_tests.xml
+/ui/keyboard/keyboard_mojom_bindings.xml
 /v8
 /webkit/data/bmp_decoder
 /webkit/data/ico_decoder