Improve comments on WebContentsObserver RenderFrame* methods and rename.

content/public/test/web_contents_observer_sanity_checker.cc

Index: content/public/test/web_contents_observer_sanity_checker.cc
diff --git a/content/public/test/web_contents_observer_sanity_checker.cc b/content/public/test/web_contents_observer_sanity_checker.cc
index 30bc6041c178ae9d319ca4898e7ca39a5d6d0d34..554992a9716d3ecdfda82103740401d18145759e 100644
--- a/content/public/test/web_contents_observer_sanity_checker.cc
+++ b/content/public/test/web_contents_observer_sanity_checker.cc
@@ -87,6 +87,11 @@ void WebContentsObserverSanityChecker::RenderFrameHostChanged(
   AssertFrameExists(new_host);
 }
 
+void WebContentsObserverSanityChecker::FrameDeleted(
+    RenderFrameHost* render_frame_host) {
+  AssertFrameExists(render_frame_host);
+}
+
 void WebContentsObserverSanityChecker::DidStartProvisionalLoadForFrame(
     RenderFrameHost* render_frame_host,
     const GURL& validated_url,
@@ -166,11 +171,6 @@ void WebContentsObserverSanityChecker::DidOpenRequestedURL(
   AssertFrameExists(source_render_frame_host);
 }
 
-void WebContentsObserverSanityChecker::FrameDetached(
-    RenderFrameHost* render_frame_host) {
-  AssertFrameExists(render_frame_host);
-}
-
 bool WebContentsObserverSanityChecker::OnMessageReceived(
     const IPC::Message& message,
     RenderFrameHost* render_frame_host) {