Disabled pinch zooming in non-browser Aura windows.

content/browser/browser_plugin/browser_plugin_guest.cc

Index: content/browser/browser_plugin/browser_plugin_guest.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest.cc b/content/browser/browser_plugin/browser_plugin_guest.cc
index 063a85a0ce86bc239aff24971a5ead7624422839..b085b4d03f691f9cdbf6764d6f4a15d98eaa3b88 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest.cc
@@ -1698,6 +1698,13 @@ void BrowserPluginGuest::RequestMediaAccessPermission(
                     request_info);
 }
 
+bool BrowserPluginGuest::PreHandleGestureEvent(
+    WebContents* source, const blink::WebGestureEvent& event) {
+  return event.type == blink::WebGestureEvent::GesturePinchBegin ||
+      event.type == blink::WebGestureEvent::GesturePinchUpdate ||
+      event.type == blink::WebGestureEvent::GesturePinchEnd;
+}
+
 void BrowserPluginGuest::RunJavaScriptDialog(
     WebContents* web_contents,
     const GURL& origin_url,