Disabled pinch zooming in non-browser Aura windows.

content/browser/web_contents/web_contents_impl.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/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 1219 matching lines @@
       event.wheelTicksY &&
       (event.modifiers & blink::WebInputEvent::ControlKey)) {
     delegate_->ContentsZoomChange(event.wheelTicksY > 0);
     return true;
   }
 #endif
 
   return false;
 }
 
+bool WebContentsImpl::PreHandleGestureEvent(
+    const blink::WebGestureEvent& event) {
+  return delegate_->PreHandleGestureEvent(this, event);
+}
+
 #if defined(OS_WIN)
 gfx::NativeViewAccessible WebContentsImpl::GetParentNativeViewAccessible() {
   return accessible_parent_;
 }
 #endif
 
 void WebContentsImpl::HandleMouseDown() {
   if (delegate_)
     delegate_->HandleMouseDown();
 }
@@ skipping 2589 matching lines @@
 }
 
 void WebContentsImpl::OnFrameRemoved(
     RenderViewHostImpl* render_view_host,
     int64 frame_id) {
    FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                      FrameDetached(render_view_host, frame_id));
 }
 
 }  // namespace content