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

content/browser/android/web_contents_observer_proxy.cc

Index: content/browser/android/web_contents_observer_proxy.cc
diff --git a/content/browser/android/web_contents_observer_proxy.cc b/content/browser/android/web_contents_observer_proxy.cc
index 8566beee8315a1a60cafb699b863384b2206b076..a8e5eacfbdafc57be8f5b0e04358310cda91b4a6 100644
--- a/content/browser/android/web_contents_observer_proxy.cc
+++ b/content/browser/android/web_contents_observer_proxy.cc
@@ -79,8 +79,7 @@ void WebContentsObserverProxy::RenderProcessGone(
                                                   was_oom_protected);
 }
 
-void WebContentsObserverProxy::DidStartLoading(
-    RenderViewHost* render_view_host) {
+void WebContentsObserverProxy::DidStartLoading() {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj(weak_java_observer_.get(env));
   if (obj.is_null())
@@ -91,8 +90,7 @@ void WebContentsObserverProxy::DidStartLoading(
                                                 jstring_url.obj());
 }
 
-void WebContentsObserverProxy::DidStopLoading(
-    RenderViewHost* render_view_host) {
+void WebContentsObserverProxy::DidStopLoading() {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj(weak_java_observer_.get(env));
   if (obj.is_null())