People should just use GetWindow() instead of calling GetWidget()->GetWindow(...

chrome/browser/views/tabs/tab_renderer.cc

 // 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 <limits>
 
 #include "chrome/browser/views/tabs/tab_renderer.h"
 
 #include "chrome/browser/browser.h"
 #include "chrome/browser/profile.h"
@@ skipping 489 matching lines @@
   hover_animation_->SetTweenType(SlideAnimation::EASE_OUT);
   hover_animation_->Show();
 }
 
 void TabRenderer::OnMouseExited(const views::MouseEvent& e) {
   hover_animation_->SetTweenType(SlideAnimation::EASE_IN);
   hover_animation_->Hide();
 }
 
 void TabRenderer::ThemeChanged() {
-  if (GetWidget() && GetWidget()->GetWindow()) {
-    LoadTabImages(
-        GetWidget()->GetWindow()->GetNonClientView()->UseNativeFrame());
-  }
+  if (GetWindow())
+    LoadTabImages(GetWindow()->GetNonClientView()->UseNativeFrame());
   View::ThemeChanged();
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // TabRenderer, AnimationDelegate implementation:
 
 void TabRenderer::AnimationProgressed(const Animation* animation) {
   SchedulePaint();
 }
 
@@ skipping 14 matching lines @@
     // as not being selected, so is_drag_clone_ ensures that we always paint
     // the active representation for the dragged tab.
     PaintActiveTabBackground(canvas);
   } else {
     // Draw our hover state.
     Animation* animation = hover_animation_.get();
     if (pulse_animation_->IsAnimating())
       animation = pulse_animation_.get();
     if (animation->GetCurrentValue() > 0) {
       PaintHoverTabBackground(canvas, animation->GetCurrentValue() *
-          (GetWidget()->GetWindow()->GetNonClientView()->UseNativeFrame() ?
+          (GetWindow()->GetNonClientView()->UseNativeFrame() ?
           kHoverOpacityVista : kHoverOpacity));
     } else {
       PaintInactiveTabBackground(canvas);
     }
   }
 }
 
 void TabRenderer::PaintInactiveTabBackground(ChromeCanvas* canvas) {
   bool is_otr = data_.off_the_record;
   canvas->DrawBitmapInt(is_otr ? *tab_inactive_otr.image_l :
@@ skipping 142 matching lines @@
     tab_inactive_otr.image_l = rb.GetBitmapNamed(IDR_TAB_INACTIVE_LEFT_OTR);
     tab_inactive_otr.image_c = rb.GetBitmapNamed(IDR_TAB_INACTIVE_CENTER_OTR);
     tab_inactive_otr.image_r = rb.GetBitmapNamed(IDR_TAB_INACTIVE_RIGHT_OTR);
   }
 
   tab_inactive.l_width = tab_inactive.image_l->width();
   tab_inactive.r_width = tab_inactive.image_r->width();
   // tab_[hover,inactive_otr] width are not used and are initialized to 0
   // during static initialization.
 }