Revert "Fix a ton of compiler warnings."

chrome/browser/renderer_host/render_widget_host.cc

 // Copyright (c) 2009 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 "chrome/browser/renderer_host/render_widget_host.h"
 
 #include "base/histogram.h"
 #include "base/message_loop.h"
 #include "base/keyboard_codes.h"
 #include "chrome/browser/renderer_host/backing_store.h"
@@ skipping 78 matching lines @@
 RenderWidgetHost::~RenderWidgetHost() {
   // Clear our current or cached backing store if either remains.
   BackingStoreManager::RemoveBackingStore(this);
 
   process_->Release(routing_id_);
 }
 
 gfx::NativeViewId RenderWidgetHost::GetNativeViewId() {
   if (view_)
     return gfx::IdFromNativeView(view_->GetNativeView());
-  return 0;
+  return NULL;
 }
 
 void RenderWidgetHost::Init() {
   DCHECK(process_->HasConnection());
 
   renderer_initialized_ = true;
 
   // Send the ack along with the information on placement.
   Send(new ViewMsg_CreatingNew_ACK(routing_id_, GetNativeViewId()));
   WasResized();
@@ skipping 756 matching lines @@
 
   // TODO(darin): do we need to do something else if our backing store is not
   // the same size as the advertised view?  maybe we just assume there is a
   // full paint on its way?
   BackingStore* backing_store = BackingStoreManager::Lookup(this);
   if (!backing_store || (backing_store->size() != view_size))
     return;
   backing_store->ScrollRect(process_->process().handle(), bitmap, bitmap_rect,
                             dx, dy, clip_rect, view_size);
 }