Fix window zoom in a sane way, remove nasty casts.

content/browser/tab_contents/tab_contents.cc

 // 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.
 
 #include "content/browser/tab_contents/tab_contents.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 746 matching lines @@
     GotResponseToLockMouseRequest(false);
   }
 }
 
 void TabContents::LostMouseLock() {
   if (delegate_)
     delegate_->LostMouseLock();
 }
 
 void TabContents::UpdatePreferredSize(const gfx::Size& pref_size) {
+  preferred_size_ = pref_size;
   if (delegate_)
     delegate_->UpdatePreferredSize(this, pref_size);
 }
 
 void TabContents::WebUISend(RenderViewHost* render_view_host,
                             const GURL& source_url,
                             const std::string& name,
                             const base::ListValue& args) {
   if (delegate_)
     delegate_->WebUISend(this, source_url, name, args);
@@ skipping 275 matching lines @@
 }
 
 int TabContents::GetMinimumZoomPercent() const {
   return minimum_zoom_percent_;
 }
 
 int TabContents::GetMaximumZoomPercent() const {
   return maximum_zoom_percent_;
 }
 
+gfx::Size TabContents::GetPreferredSize() const {
+  return preferred_size_;
+}
+
 int TabContents::GetContentRestrictions() const {
   return content_restrictions_;
 }
 
 WebUI::TypeID TabContents::GetWebUITypeForCurrentState() {
   return content::GetContentClient()->browser()->GetWebUIFactory()->
       GetWebUIType(GetBrowserContext(), GetURL());
 }
 
 WebUI* TabContents::GetWebUIForCurrentState() {
@@ skipping 1165 matching lines @@
   encoding_ = content::GetContentClient()->browser()->
       GetCanonicalEncodingNameByAliasName(encoding);
 }
 
 void TabContents::CreateViewAndSetSizeForRVH(RenderViewHost* rvh) {
   RenderWidgetHostView* rwh_view = GetView()->CreateViewForWidget(rvh);
   // Can be NULL during tests.
   if (rwh_view)
     rwh_view->SetSize(GetView()->GetContainerSize());
 }