Mojofy FrameHostMsg_FrameFocused.

Since this is the first RenderFrameHostProxy/RenderFrameProxy method to
be mojofied, this CL also adds the boilerplate for establishing a mojo
connection between RenderFrameHostProxy/RenderFrameProxy.

Change-Id: I9153eb01b7a5bef374823a067eaf793a48b6a3fe
Bug: 786836
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643473
Commit-Queue: Lowell Manners <[email protected]>
Reviewed-by: Ken Rockot <[email protected]>
Reviewed-by: Alex Moshchuk <[email protected]>
Reviewed-by: Daniel Cheng <[email protected]>
Cr-Commit-Position: refs/heads/master@{#683111}
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index c479113..0553fec 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -6179,7 +6179,7 @@
     // the outer WebContents FrameTreeNode is at |source|'s SiteInstance.
     // Transfer the focus to the inner WebContents if the outer WebContents is
     // focused. This branch is used when an inner WebContents is focused through
-    // its RenderFrameProxyHost (via FrameHostMsg_FrameFocused IPC, used to
+    // its RenderFrameProxyHost (via FrameFocused mojo call, used to
     // implement the window.focus() API).
     if (GetFocusedWebContents() == GetOuterWebContents())
       SetAsFocusedWebContentsIfNecessary();