Disabled pinch zooming in non-browser Aura windows.

chrome/browser/ui/autofill/autofill_dialog_sign_in_delegate.cc

Index: chrome/browser/ui/autofill/autofill_dialog_sign_in_delegate.cc
diff --git a/chrome/browser/ui/autofill/autofill_dialog_sign_in_delegate.cc b/chrome/browser/ui/autofill/autofill_dialog_sign_in_delegate.cc
index 987a0a8ff83cfefb07db589302e8467eac02fc54..b1737ea23d051309025f70eddf322e4e05235687 100644
--- a/chrome/browser/ui/autofill/autofill_dialog_sign_in_delegate.cc
+++ b/chrome/browser/ui/autofill/autofill_dialog_sign_in_delegate.cc
@@ -11,6 +11,7 @@
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/renderer_preferences.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/base/window_open_disposition.h"
 
 namespace autofill {
@@ -97,6 +98,15 @@ void AutofillDialogSignInDelegate::AddNewContents(
       was_blocked);
 }
 
+bool AutofillDialogSignInDelegate::PreHandleGestureEvent(
+    content::WebContents* source,
+    const blink::WebGestureEvent& event) {
+  // Disable pinch zooming.
+  return event.type == blink::WebGestureEvent::GesturePinchBegin ||
+      event.type == blink::WebGestureEvent::GesturePinchUpdate ||
+      event.type == blink::WebGestureEvent::GesturePinchEnd;
+}
+
 void AutofillDialogSignInDelegate::RenderViewCreated(
     content::RenderViewHost* render_view_host) {
   EnableAutoResize();