Clean up TCW, make it solely a hub for 1:1 observer/helper objects.

chrome/browser/ui/cocoa/tabpose_window.mm

 // Copyright (c) 2011 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.
 
 #import "chrome/browser/ui/cocoa/tabpose_window.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <algorithm>
 
@@ skipping 242 matching lines @@
   int bottomOffset = 0;
   TabContentsWrapper* devToolsContents =
       DevToolsWindow::GetDevToolsContents(contents_->tab_contents());
   if (devToolsContents && devToolsContents->tab_contents() &&
       devToolsContents->tab_contents()->render_view_host() &&
       devToolsContents->tab_contents()->render_view_host()->view()) {
     // The devtool's size might not be up-to-date, but since its height doesn't
     // change on window resize, and since most users don't use devtools, this is
     // good enough.
     bottomOffset +=
-        devToolsContents->render_view_host()->view()->GetViewBounds().height();
+        devToolsContents->tab_contents()->render_view_host()->view()->
+            GetViewBounds().height();
     bottomOffset += 1;  // :-( Divider line between web contents and devtools.
   }
   return bottomOffset;
 }
 
 - (void)drawBackingStore:(BackingStoreMac*)backing_store
                   inRect:(CGRect)destRect
                  context:(CGContextRef)context {
   // TODO(thakis): Add a sublayer for each accelerated surface in the rwhv.
   // Until then, accelerated layers (CoreAnimation NPAPI plugins, compositor)
   // won't show up in tabpose.
   gfx::ScopedCGContextSaveGState CGContextSaveGState(context);
   CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
   if (backing_store->cg_layer()) {
     CGContextDrawLayerInRect(context, destRect, backing_store->cg_layer());
   } else {
     base::mac::ScopedCFTypeRef<CGImageRef> image(
         CGBitmapContextCreateImage(backing_store->cg_bitmap()));
     CGContextDrawImage(context, destRect, image);
   }
 }
 
 - (void)drawInContext:(CGContextRef)context {
-  RenderWidgetHost* rwh = contents_->render_view_host();
+  RenderWidgetHost* rwh = contents_->tab_contents()->render_view_host();
   // NULL if renderer crashed.
   RenderWidgetHostView* rwhv = rwh ? rwh->view() : NULL;
   if (!rwhv) {
     // TODO(thakis): Maybe draw a sad tab layer?
     [super drawInContext:context];
     return;
   }
 
   // The size of the TabContent's RenderWidgetHost might not fit to the
   // current browser window at all, for example if the window was resized while
@@ skipping 1384 matching lines @@
   tile.set_tab_contents(contents);
   ThumbnailLayer* thumbLayer = [allThumbnailLayers_ objectAtIndex:index];
   [thumbLayer setTabContents:contents];
 }
 
 - (void)tabStripModelDeleted {
   [self close];
 }
 
 @end