Add .DS_Store to the .gitignore file.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/2702002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@49062 0039d316-1c4b-4281-b951-d872f2087c98

.gitignore

@@ -11,11 +11,11 @@
 *.xcodeproj
 *~
 .*.sw?
+.cproject
+.DS_Store
 .metadata
 .project
-.cproject
 /_out
-/Makefile
 /breakpad/src/
 /build/util/support
 /chrome/Debug
@@ -40,6 +40,7 @@
 /data
 /googleurl
 /gpu/gles2_conform_test
+/Makefile
 /native_client
 /out
 /rlz/binaries