mac: History swiping doesn't work right with iframes.

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 "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target_base.h"
@@ skipping 435 matching lines @@
     return base::string16();
   return selection_text_.substr(
       selection_range_.GetMin() - selection_text_offset_,
       selection_range_.length());
 }
 
 bool RenderWidgetHostViewBase::IsMouseLocked() {
   return mouse_locked_;
 }
 
-void RenderWidgetHostViewBase::UnhandledWheelEvent(
-    const blink::WebMouseWheelEvent& event) {
+void RenderWidgetHostViewBase::HandledWheelEvent(
+    const blink::WebMouseWheelEvent& event,
+    bool consumed) {
   // Most implementations don't need to do anything here.
 }
 
 InputEventAckState RenderWidgetHostViewBase::FilterInputEvent(
     const blink::WebInputEvent& input_event) {
   // By default, input events are simply forwarded to the renderer.
   return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
 }
 
 void RenderWidgetHostViewBase::OnDidFlushInput() {
@@ skipping 140 matching lines @@
   if (!impl)
     return;
   impl->FlushInput();
 }
 
 SkBitmap::Config RenderWidgetHostViewBase::PreferredReadbackFormat() {
   return SkBitmap::kARGB_8888_Config;
 }
 
 }  // namespace content