Add WebKit prefix to MediaSource,SourceBuffer, and SourceBufferList objects.

Source/WebKit/chromium/src/WebRuntimeFeatures.cpp

Index: Source/WebKit/chromium/src/WebRuntimeFeatures.cpp
diff --git a/Source/WebKit/chromium/src/WebRuntimeFeatures.cpp b/Source/WebKit/chromium/src/WebRuntimeFeatures.cpp
index 0251856f4ac5df6d6ded688d7c0c8496844a7f79..ed0ce08fe2432eb030b3e77041a3e9ef00c7576c 100644
--- a/Source/WebKit/chromium/src/WebRuntimeFeatures.cpp
+++ b/Source/WebKit/chromium/src/WebRuntimeFeatures.cpp
@@ -349,12 +349,26 @@ bool WebRuntimeFeatures::isMediaPlayerEnabled()
 
 void WebRuntimeFeatures::enableMediaSource(bool enable)
 {
-    RuntimeEnabledFeatures::setMediaSourceEnabled(enable);
+    // FIXME: Change to setMediaSourceEnabled() once Chromium
+    // starts calling enableWebKitMediaSource().
+    RuntimeEnabledFeatures::setWebKitMediaSourceEnabled(enable);
 }
 
 bool WebRuntimeFeatures::isMediaSourceEnabled()
 {
-    return RuntimeEnabledFeatures::mediaSourceEnabled();
+    // FIXME: Change to mediaSourceEnabled() once Chromium
+    // starts calling isWebKitMediaSourceEnabled()
+    return RuntimeEnabledFeatures::webKitMediaSourceEnabled();
+}
+
+void WebRuntimeFeatures::enableWebKitMediaSource(bool enable)
+{
+    RuntimeEnabledFeatures::setWebKitMediaSourceEnabled(enable);
+}
+
+bool WebRuntimeFeatures::isWebKitMediaSourceEnabled()
+{
+    return RuntimeEnabledFeatures::webKitMediaSourceEnabled();
 }
 
 void WebRuntimeFeatures::enableMediaStream(bool enable)