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

content/browser/web_contents/web_contents_impl_browsertest.cc

Index: content/browser/web_contents/web_contents_impl_browsertest.cc
diff --git a/content/browser/web_contents/web_contents_impl_browsertest.cc b/content/browser/web_contents/web_contents_impl_browsertest.cc
index 876bd7b383fc6a3319f82852a39021aede240cf0..8cdfedfaa3c6d52715b2164eed65138b1b6c88f1 100644
--- a/content/browser/web_contents/web_contents_impl_browsertest.cc
+++ b/content/browser/web_contents/web_contents_impl_browsertest.cc
@@ -497,14 +497,14 @@ struct LoadProgressDelegateAndObserver : public WebContentsDelegate,
   }
 
   // WebContentsObserver:
-  void DidStartLoading(RenderViewHost* render_view_host) override {
+  void DidStartLoading() override {
     EXPECT_FALSE(did_start_loading);
     EXPECT_EQ(0U, progresses.size());
     EXPECT_FALSE(did_stop_loading);
     did_start_loading = true;
   }
 
-  void DidStopLoading(RenderViewHost* render_view_host) override {
+  void DidStopLoading() override {
     EXPECT_TRUE(did_start_loading);
     EXPECT_GE(progresses.size(), 1U);
     EXPECT_FALSE(did_stop_loading);
@@ -642,4 +642,3 @@ IN_PROC_BROWSER_TEST_F(WebContentsImplBrowserTest,
 }
 
 }  // namespace content
-