Make RenderFrameHostImpl::GetRenderWidgetHost() always return an object

content/browser/frame_host/cross_process_frame_connector.cc

 // Copyright 2014 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/frame_host/cross_process_frame_connector.h"
 
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/browser/compositor/surface_utils.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 259 matching lines @@
     child_widget->NotifyScreenInfoChanged();
   }
 }
 
 void CrossProcessFrameConnector::SetRect(const gfx::Rect& frame_rect) {
   gfx::Rect old_rect = child_frame_rect_;
   child_frame_rect_ = frame_rect;
   if (view_) {
     view_->SetBounds(frame_rect);
 
-    // Out-of-process iframes nested underneath this one implicitly have their
+    // Other local root frames nested underneath this one implicitly have their
     // view rects changed when their ancestor is repositioned, and therefore
     // need to have their screen rects updated.
     FrameTreeNode* proxy_node =
         frame_proxy_in_parent_renderer_->frame_tree_node();
     if (old_rect.x() != child_frame_rect_.x() ||
         old_rect.y() != child_frame_rect_.y()) {
       for (FrameTreeNode* node :
            proxy_node->frame_tree()->SubtreeNodes(proxy_node)) {
-        if (node != proxy_node &&
-            node->current_frame_host()->GetRenderWidgetHost())
+        if (node != proxy_node && node->current_frame_host()->is_local_root())
           node->current_frame_host()->GetRenderWidgetHost()->SendScreenRects();
       }
     }
   }
 }
 
 RenderWidgetHostViewBase*
 CrossProcessFrameConnector::GetRootRenderWidgetHostView() {
   RenderFrameHostImpl* top_host = frame_proxy_in_parent_renderer_->
       frame_tree_node()->frame_tree()->root()->current_frame_host();
@@ skipping 25 matching lines @@
 
   if (parent) {
     return static_cast<RenderWidgetHostViewBase*>(
         parent->current_frame_host()->GetView());
   }
 
   return nullptr;
 }
 
 }  // namespace content