Disabled pinch zooming in non-browser Aura windows.

content/browser/renderer_host/render_widget_host_delegate.h

Index: content/browser/renderer_host/render_widget_host_delegate.h
diff --git a/content/browser/renderer_host/render_widget_host_delegate.h b/content/browser/renderer_host/render_widget_host_delegate.h
index 22f5a19a48984a4ce3047da4d09556a0ec93b01a..80379c5dca7d7cdb782095bd87f01d7fa4141592 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -11,6 +11,7 @@
 
 namespace blink {
 class WebMouseWheelEvent;
+class WebGestureEvent;
 }
 
 namespace content {
@@ -46,6 +47,11 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   // Returns true if the |event| was handled.
   virtual bool PreHandleWheelEvent(const blink::WebMouseWheelEvent& event);
 
+  // Callback to give the browser a chance to handle the specified gesture
+  // event before sending it to the renderer.
+  // Returns true if the |event| was handled.
+  virtual bool PreHandleGestureEvent(const blink::WebGestureEvent& event);
+
   // Notifies that screen rects were sent to renderer process.
   virtual void DidSendScreenRects(RenderWidgetHostImpl* rwh) {}