[merge m57][autofill] Verify widget view is valid before using it.

components/autofill/content/browser/content_autofill_driver.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 "components/autofill/content/browser/content_autofill_driver.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 141 matching lines @@
 
 void ContentAutofillDriver::PopupHidden() {
   // If the unmask prompt is showing, keep showing the preview. The preview
   // will be cleared when the prompt closes.
   if (!autofill_manager_->IsShowingUnmaskPrompt())
     RendererShouldClearPreviewedForm();
 }
 
 gfx::RectF ContentAutofillDriver::TransformBoundingBoxToViewportCoordinates(
     const gfx::RectF& bounding_box) {
+  content::RenderWidgetHostView* view = render_frame_host_->GetView();
+  if (!view)
+    return bounding_box;
+
   gfx::Point orig_point(bounding_box.x(), bounding_box.y());
-  gfx::Point transformed_point;
-  transformed_point =
-      render_frame_host_->GetView()->TransformPointToRootCoordSpace(orig_point);
-
-  gfx::RectF new_box;
-  new_box.SetRect(transformed_point.x(), transformed_point.y(),
-                  bounding_box.width(), bounding_box.height());
-  return new_box;
+  gfx::Point transformed_point =
+      view->TransformPointToRootCoordSpace(orig_point);
+  return gfx::RectF(transformed_point.x(), transformed_point.y(),
+                    bounding_box.width(), bounding_box.height());
 }
 
 void ContentAutofillDriver::DidInteractWithCreditCardForm() {
   // Notify the WebContents about credit card inputs on HTTP pages.
   content::WebContents* contents =
       content::WebContents::FromRenderFrameHost(render_frame_host_);
   if (contents->GetVisibleURL().SchemeIsCryptographic())
     return;
   contents->OnCreditCardInputShownOnHttp();
 }
@@ skipping 79 matching lines @@
   // Here is a lazy binding, and will not reconnect after connection error.
   if (!autofill_agent_) {
     render_frame_host_->GetRemoteInterfaces()->GetInterface(
         mojo::MakeRequest(&autofill_agent_));
   }
 
   return autofill_agent_;
 }
 
 }  // namespace autofill