Move webrtc behind flag(--enable-webrtc) for M27 branch

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
===================================================================
--- chrome/app/generated_resources.grd	(revision 191376)
+++ chrome/app/generated_resources.grd	(working copy)
@@ -6570,11 +6570,11 @@
       <message name="IDS_FLAGS_DISABLE_WEBGL_DESCRIPTION" desc="Description for the flag to disable WebGL.">
         Enabling this option prevents web applications from accessing the WebGL API.
       </message>
-      <message name="IDS_FLAGS_DISABLE_WEBRTC_NAME" desc="Name of the 'Disable WebRTC' lab.">
-        Disable WebRTC
+      <message name="IDS_FLAGS_ENABLE_WEBRTC_NAME" desc="Name of the 'Enable WebRTC' lab.">
+        Enable WebRTC
       </message>
-      <message name="IDS_FLAGS_DISABLE_WEBRTC_DESCRIPTION" desc="Description for the flag to disable WebRTC.">
-        Enabling this option prevents web applications from accessing the WebRTC API.
+      <message name="IDS_FLAGS_ENABLE_WEBRTC_DESCRIPTION" desc="Description for the flag to enable WebRTC.">
+        Enabling this option allows web applications to access the WebRTC API.
       </message>
       <message name="IDS_FLAGS_FIXED_POSITION_CREATES_STACKING_CONTEXT_NAME" desc="Name of the 'Fixed position creates stacking context' lab.">
         Fixed position elements create stacking contexts.