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

content/browser/renderer_host/render_view_host_impl.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 475 matching lines @@
   void OnUpdateState(int32 page_id, const PageState& state);
   void OnUpdateTitle(int32 page_id,
                      const base::string16& title,
                      blink::WebTextDirection title_direction);
   void OnUpdateEncoding(const std::string& encoding);
   void OnUpdateTargetURL(int32 page_id, const GURL& url);
   void OnClose();
   void OnRequestMove(const gfx::Rect& pos);
   void OnDidChangeLoadProgress(double load_progress);
   void OnDocumentAvailableInMainFrame();
-  void OnDocumentOnLoadCompletedInMainFrame(int32 page_id);
+  void OnDocumentOnLoadCompletedInMainFrame();
   void OnToggleFullscreen(bool enter_fullscreen);
   void OnDidContentsPreferredSizeChange(const gfx::Size& new_size);
   void OnDidChangeScrollOffset();
   void OnDidChangeScrollOffsetPinningForMainFrame(bool is_pinned_to_left,
                                                   bool is_pinned_to_right);
   void OnDidChangeNumWheelEvents(int count);
 #if defined(OS_ANDROID)
   void OnSelectionRootBoundsChanged(const gfx::Rect& bounds);
 #endif
   void OnPasteFromSelectionClipboard();
@@ skipping 143 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_