Remove RenderViewHost parameter from WebContentsObserver::Did{Start|Stop}Loading.

chrome/browser/policy/policy_browsertest.cc

Index: chrome/browser/policy/policy_browsertest.cc
diff --git a/chrome/browser/policy/policy_browsertest.cc b/chrome/browser/policy/policy_browsertest.cc
index 2fb6530e04a942910692cba2ebe2c73bcd4041d4..45f42922be33bba08a1e90f279c3cf1bf4bc0437 100644
--- a/chrome/browser/policy/policy_browsertest.cc
+++ b/chrome/browser/policy/policy_browsertest.cc
@@ -525,7 +525,7 @@ class WebContentsLoadedOrDestroyedWatcher
 
   // Overridden WebContentsObserver methods.
   void WebContentsDestroyed() override;
-  void DidStopLoading(content::RenderViewHost* render_view_host) override;
+  void DidStopLoading() override;
 
  private:
   scoped_refptr<content::MessageLoopRunner> message_loop_runner_;
@@ -549,8 +549,7 @@ void WebContentsLoadedOrDestroyedWatcher::WebContentsDestroyed() {
   message_loop_runner_->Quit();
 }
 
-void WebContentsLoadedOrDestroyedWatcher::DidStopLoading(
-    content::RenderViewHost* render_view_host) {
+void WebContentsLoadedOrDestroyedWatcher::DidStopLoading() {
   message_loop_runner_->Quit();
 }