OOPIF: Clear old focused frame when focus moves to a cross-process frame.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 06490d55ed496054137b5660a645524a421e2206..72db737eab32af2244cde4a87fac233cbfb92514 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1126,6 +1126,7 @@ bool RenderFrameImpl::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(FrameMsg_UpdateOpener, OnUpdateOpener)
     IPC_MESSAGE_HANDLER(FrameMsg_CommitNavigation, OnCommitNavigation)
     IPC_MESSAGE_HANDLER(FrameMsg_DidUpdateSandboxFlags, OnDidUpdateSandboxFlags)
+    IPC_MESSAGE_HANDLER(FrameMsg_ClearFocus, OnClearFocus)
     IPC_MESSAGE_HANDLER(FrameMsg_SetTextTrackSettings,
                         OnTextTrackSettingsChanged)
     IPC_MESSAGE_HANDLER(FrameMsg_PostMessageEvent, OnPostMessageEvent)
@@ -1682,6 +1683,10 @@ void RenderFrameImpl::OnDidUpdateSandboxFlags(blink::WebSandboxFlags flags) {
   frame_->setFrameOwnerSandboxFlags(flags);
 }
 
+void RenderFrameImpl::OnClearFocus() {
+  frame_->clearFocus();
+}
+
 void RenderFrameImpl::OnTextTrackSettingsChanged(
     const FrameMsg_TextTrackSettings_Params& params) {
   DCHECK(!frame_->parent());