Remove WebContentsObserver::ProvisionalChangeToMainFrameUrl and all the code supporting it.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 14cf8a42cbf21eccfb415e69ffb85cac85fb0cd7..a32c270a09903e18f9c9d3d7d4d83a6ef5cfe0bf 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -2469,14 +2469,6 @@ void WebContentsImpl::DidStartProvisionalLoad(
       observers_,
       DidStartProvisionalLoadForFrame(
           render_frame_host, validated_url, is_error_page, is_iframe_srcdoc));
-
-  if (!render_frame_host->GetParent()) {
-    FOR_EACH_OBSERVER(
-        WebContentsObserver,
-        observers_,
-        ProvisionalChangeToMainFrameUrl(validated_url,
-                                        render_frame_host));
-  }
 }
 
 void WebContentsImpl::DidStartNavigationTransition(
@@ -2560,17 +2552,6 @@ bool WebContentsImpl::ShouldPreserveAbortedURLs() {
   return delegate_->ShouldPreserveAbortedURLs(this);
 }
 
-void WebContentsImpl::DidRedirectProvisionalLoad(
-    RenderFrameHostImpl* render_frame_host,
-    const GURL& validated_target_url) {
-  // Notify observers about the provisional change in the main frame URL.
-  FOR_EACH_OBSERVER(
-      WebContentsObserver,
-      observers_,
-      ProvisionalChangeToMainFrameUrl(validated_target_url,
-                                      render_frame_host));
-}
-
 void WebContentsImpl::DidCommitProvisionalLoad(
     RenderFrameHostImpl* render_frame_host,
     const GURL& url,