Fix chromium.webrtc.fyi GN bot targets

The chromium_builder_webrtc target doesn't exist for GN, so
add the needed targets manually to the test specs.

BUG=561552
TBR=dpranke@chromium.org
NOTRY=True
TESTED=testing/buildbot/manage.py -c

Review URL: https://codereview.chromium.org/1515503003

Cr-Commit-Position: refs/heads/master@{#364059}

testing/buildbot/chromium.webrtc.fyi.json

@@ -12,9 +12,12 @@
   "Linux Builder": {
     "additional_compile_targets": [
       "browser_tests",
-      "chromium_builder_webrtc",
       "content_browsertests",
-      "content_unittests"
+      "content_unittests",
+      "frame_analyzer",
+      "media_unittests",
+      "midi_unittests",
+      "rgba_to_i420_converter"
     ]
   },
   "Linux Tester": {
@@ -31,17 +34,23 @@
   "Mac GN": {
     "additional_compile_targets": [
       "browser_tests",
-      "chromium_builder_webrtc",
       "content_browsertests",
-      "content_unittests"
+      "content_unittests",
+      "frame_analyzer",
+      "media_unittests",
+      "midi_unittests",
+      "rgba_to_i420_converter"
     ]
   },
   "Mac GN (dbg)": {
     "additional_compile_targets": [
       "browser_tests",
-      "chromium_builder_webrtc",
       "content_browsertests",
-      "content_unittests"
+      "content_unittests",
+      "frame_analyzer",
+      "media_unittests",
+      "midi_unittests",
+      "rgba_to_i420_converter"
     ]
   },
   "Mac Tester": {
@@ -58,17 +67,25 @@
   "Win x64 GN": {
     "additional_compile_targets": [
       "browser_tests",
-      "chromium_builder_webrtc",
+      "crash_service",
       "content_browsertests",
-      "content_unittests"
+      "content_unittests",
+      "frame_analyzer",
+      "media_unittests",
+      "midi_unittests",
+      "rgba_to_i420_converter"
     ]
   },
   "Win x64 GN (dbg)": {
     "additional_compile_targets": [
       "browser_tests",
-      "chromium_builder_webrtc",
+      "crash_service",
       "content_browsertests",
-      "content_unittests"
+      "content_unittests",
+      "frame_analyzer",
+      "media_unittests",
+      "midi_unittests",
+      "rgba_to_i420_converter"
     ]
   },
   "Win10 Tester": {