Remove page IDs from three WebContentsObserver APIs that don't need it.

content/browser/web_contents/aura/overscroll_navigation_overlay.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/aura/overscroll_navigation_overlay.h"
 
 #include "content/browser/frame_host/navigation_entry_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/aura/image_window_delegate.h"
 #include "content/browser/web_contents/web_contents_impl.h"
@@ skipping 283 matching lines @@
   // we don't need to do anything.
   // This check prevents StopObservingIfDone() being called multiple times
   // (including recursively) for a single event.
   if (window_slider_.get()) {
     // The slider has just been destroyed. Release the ownership.
     WindowSlider* slider ALLOW_UNUSED = window_slider_.release();
     StopObservingIfDone();
   }
 }
 
-void OverscrollNavigationOverlay::DocumentOnLoadCompletedInMainFrame(
-    int32 page_id) {
+void OverscrollNavigationOverlay::DocumentOnLoadCompletedInMainFrame() {
   // Use the last committed entry rather than the active one, in case a
   // pending entry has been created.
   int committed_entry_id =
       web_contents_->GetController().GetLastCommittedEntry()->GetUniqueID();
   // Consider the loading completed once the main frame has loaded.
   if (committed_entry_id == pending_entry_id_ || !pending_entry_id_) {
     loading_complete_ = true;
     StopObservingIfDone();
   }
 }
 
-void OverscrollNavigationOverlay::DidFirstVisuallyNonEmptyPaint(int32 page_id) {
+void OverscrollNavigationOverlay::DidFirstVisuallyNonEmptyPaint() {
   int visible_entry_id =
       web_contents_->GetController().GetVisibleEntry()->GetUniqueID();
   if (visible_entry_id == pending_entry_id_ || !pending_entry_id_) {
     received_paint_update_ = true;
     StopObservingIfDone();
   }
 }
 
 void OverscrollNavigationOverlay::DidStopLoading(RenderViewHost* host) {
   // Use the last committed entry rather than the active one, in case a
@@ skipping 14 matching lines @@
 bool OverscrollNavigationOverlay::OnMessageReceived(
     const IPC::Message& message) {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   IPC_BEGIN_MESSAGE_MAP(OverscrollNavigationOverlay, message)
     IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateRect, OnUpdateRect)
   IPC_END_MESSAGE_MAP()
   return false;
 }
 
 }  // namespace content