Revert of Add support for entering/exiting HTML fullscreen from OOPIFs.

content/renderer/render_frame_proxy.cc

Index: content/renderer/render_frame_proxy.cc
diff --git a/content/renderer/render_frame_proxy.cc b/content/renderer/render_frame_proxy.cc
index b364b2bd6bdad4a8217f62595c2b18f4f8d6c878..0509de6290e9e98524aacb606d37967ebdf5f3c2 100644
--- a/content/renderer/render_frame_proxy.cc
+++ b/content/renderer/render_frame_proxy.cc
@@ -274,7 +274,6 @@
     IPC_MESSAGE_HANDLER(FrameMsg_DidUpdateOrigin, OnDidUpdateOrigin)
     IPC_MESSAGE_HANDLER(InputMsg_SetFocus, OnSetPageFocus)
     IPC_MESSAGE_HANDLER(FrameMsg_SetFocusedFrame, OnSetFocusedFrame)
-    IPC_MESSAGE_HANDLER(FrameMsg_WillEnterFullscreen, OnWillEnterFullscreen)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -367,10 +366,6 @@
   // This uses focusDocumentView rather than setFocusedFrame so that blur
   // events are properly dispatched on any currently focused elements.
   render_view_->webview()->focusDocumentView(web_frame_);
-}
-
-void RenderFrameProxy::OnWillEnterFullscreen() {
-  render_view_->webview()->willEnterFullScreen(web_frame_);
 }
 
 void RenderFrameProxy::frameDetached(DetachType type) {