First cut at popup blocking for Mac. Remove ifdefs in cross-platform code. Im...

chrome/browser/tab_contents/tab_contents_view_mac.mm

 // Copyright (c) 2006-2008 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/tab_contents/tab_contents_view_mac.h"
 
 #include "chrome/browser/browser.h" // TODO(beng): this dependency is awful.
 #include "chrome/browser/cocoa/sad_tab_view.h"
 #include "chrome/browser/renderer_host/render_widget_host.h"
 #include "chrome/browser/renderer_host/render_widget_host_view_mac.h"
@@ skipping 30 matching lines @@
   cocoa_view_.reset(view);
 }
 
 RenderWidgetHostView* TabContentsViewMac::CreateViewForWidget(
     RenderWidgetHost* render_widget_host) {
   DCHECK(!render_widget_host->view());
   RenderWidgetHostViewMac* view =
       new RenderWidgetHostViewMac(render_widget_host);
 
   // Fancy layout comes later; for now just make it our size and resize it
-  // with us.
+  // with us. In case there are other siblings of the content area, we want
+  // to make sure the content area is on the bottom so other things draw over
+  // it.
   NSView* view_view = view->native_view();
-  [cocoa_view_.get() addSubview:view_view];
   [view_view setFrame:[cocoa_view_.get() bounds]];
   [view_view setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
-
+  [cocoa_view_.get() addSubview:view_view
+                     positioned:NSWindowBelow
+                     relativeTo:nil];
   return view;
 }
 
 gfx::NativeView TabContentsViewMac::GetNativeView() const {
   return cocoa_view_.get();
 }
 
 gfx::NativeView TabContentsViewMac::GetContentNativeView() const {
   if (!tab_contents()->render_widget_host_view())
     return NULL;
@@ skipping 207 matching lines @@
 }
 
 - (void)paste:(id)sender {
   TabContentsView_->tab_contents()->Paste();
 }
 
 // Tons of stuff goes here, where we grab events going on in Cocoaland and send
 // them into the C++ system. TODO(avi): all that jazz
 
 @end