Convert ChromeExtensionWebContentsObserver to use the new navigation callbacks.

chrome/browser/extensions/chrome_extension_web_contents_observer.cc

Index: chrome/browser/extensions/chrome_extension_web_contents_observer.cc
diff --git a/chrome/browser/extensions/chrome_extension_web_contents_observer.cc b/chrome/browser/extensions/chrome_extension_web_contents_observer.cc
index 1fd5b621453a4927fae88955d02dda04241ecde0..31b436bca48947707efa6edfcc6efdc3aabbe35e 100644
--- a/chrome/browser/extensions/chrome_extension_web_contents_observer.cc
+++ b/chrome/browser/extensions/chrome_extension_web_contents_observer.cc
@@ -17,6 +17,7 @@
 #include "components/rappor/rappor_service_impl.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/child_process_security_policy.h"
+#include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
@@ -78,13 +79,11 @@ void ChromeExtensionWebContentsObserver::RenderViewCreated(
   }
 }
 
-void ChromeExtensionWebContentsObserver::DidCommitProvisionalLoadForFrame(
-    content::RenderFrameHost* render_frame_host,
-    const GURL& url,
-    ui::PageTransition transition_type) {
-  ExtensionWebContentsObserver::DidCommitProvisionalLoadForFrame(
-      render_frame_host, url, transition_type);
-  SetExtensionIsolationTrial(render_frame_host);
+void ChromeExtensionWebContentsObserver::DidFinishNavigation(
+    content::NavigationHandle* navigation_handle) {
+  ExtensionWebContentsObserver::DidFinishNavigation(navigation_handle);
+  if (navigation_handle->HasCommitted())
+    SetExtensionIsolationTrial(navigation_handle->GetRenderFrameHost());
 }
 
 bool ChromeExtensionWebContentsObserver::OnMessageReceived(