Cleanup: Remove video constraint names

content/common/media/media_stream_options.cc

Index: content/common/media/media_stream_options.cc
diff --git a/content/common/media/media_stream_options.cc b/content/common/media/media_stream_options.cc
index 1b2b1e2750aa089de062243add4cb6024dacae7e..944d3d4b5617c7430fe6218a8d4b24005d14947e 100644
--- a/content/common/media/media_stream_options.cc
+++ b/content/common/media/media_stream_options.cc
@@ -8,18 +8,10 @@
 
 namespace content {
 
-const char kMediaStreamSource[] = "chromeMediaSource";
-const char kMediaStreamSourceId[] = "chromeMediaSourceId";
-const char kMediaStreamSourceInfoId[] = "sourceId";
 const char kMediaStreamSourceTab[] = "tab";
 const char kMediaStreamSourceScreen[] = "screen";
 const char kMediaStreamSourceDesktop[] = "desktop";
 const char kMediaStreamSourceSystem[] = "system";
-const char kMediaStreamRenderToAssociatedSink[] =
-    "chromeRenderToAssociatedSink";
-// The prefix of this constant is 'goog' to match with other getUserMedia
-// constraints for audio.
-const char kMediaStreamAudioHotword[] = "googHotword";
 
 TrackControls::TrackControls()
     : requested(false) {}