Only perform dialog Layout() once during Widget::Init().

ui/views/widget/root_view.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 "ui/views/widget/root_view.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 175 matching lines @@
 
 void RootView::SetContentsView(View* contents_view) {
   DCHECK(contents_view && GetWidget()->native_widget()) <<
       "Can't be called until after the native widget is created!";
   // The ContentsView must be set up _after_ the window is created so that its
   // Widget pointer is valid.
   SetLayoutManager(new FillLayout);
   if (has_children())
     RemoveAllChildViews(true);
   AddChildView(contents_view);
-
-  // Force a layout now, since the attached hierarchy won't be ready for the
-  // containing window's bounds. Note that we call Layout directly rather than
-  // calling the widget's size changed handler, since the RootView's bounds may
-  // not have changed, which will cause the Layout not to be done otherwise.
-  Layout();
 }
 
 View* RootView::GetContentsView() {
   return child_count() > 0 ? child_at(0) : NULL;
 }
 
 void RootView::NotifyNativeViewHierarchyChanged() {
   PropagateNativeViewHierarchyChanged();
 }
 
@@ skipping 540 matching lines @@
 
 #ifndef NDEBUG
   DCHECK(!event_dispatch_target_ || Contains(event_dispatch_target_));
 #endif
 
   return details;
 }
 
 }  // namespace internal
 }  // namespace views