Fix form validation bubble positioning at hidpi.

content/browser/renderer_host/render_widget_host_view_base.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 "content/browser/renderer_host/render_widget_host_view_base.h"
 
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
@@ skipping 305 matching lines @@
 void RenderWidgetHostViewBase::EndFrameSubscription() {
   NOTREACHED();
 }
 
 void RenderWidgetHostViewBase::FocusedNodeTouched(
     const gfx::Point& location_dips_screen,
     bool editable) {
   DVLOG(1) << "FocusedNodeTouched: " << editable;
 }
 
+float RenderWidgetHostViewBase::GetDeviceScaleFactor() const {
+  // Non-aura platforms don't have a conception of device scale factor, so
+  // return a no-op value if it gets used.
+  return 1.f;
+}
+
 uint32_t RenderWidgetHostViewBase::RendererFrameNumber() {
   return renderer_frame_number_;
 }
 
 void RenderWidgetHostViewBase::DidReceiveRendererFrame() {
   ++renderer_frame_number_;
 }
 
 void RenderWidgetHostViewBase::FlushInput() {
   RenderWidgetHostImpl* impl = NULL;
@@ skipping 186 matching lines @@
 
 bool RenderWidgetHostViewBase::IsChildFrameForTesting() const {
   return false;
 }
 
 cc::SurfaceId RenderWidgetHostViewBase::SurfaceIdForTesting() const {
   return cc::SurfaceId();
 }
 
 }  // namespace content