Disabled pinch zooming in non-browser Aura windows.

chrome/browser/chromeos/first_run/first_run_view.cc

Index: chrome/browser/chromeos/first_run/first_run_view.cc
diff --git a/chrome/browser/chromeos/first_run/first_run_view.cc b/chrome/browser/chromeos/first_run/first_run_view.cc
index 211898f1eab483d0046b8356caea41d46512c470..8ee4c7179b81c7462e8fbc20fba130aa8396bc4f 100644
--- a/chrome/browser/chromeos/first_run/first_run_view.cc
+++ b/chrome/browser/chromeos/first_run/first_run_view.cc
@@ -10,6 +10,7 @@
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/views/controls/webview/webview.h"
 #include "url/gurl.h"
@@ -60,5 +61,14 @@ bool FirstRunView::HandleContextMenu(
   return true;
 }
 
+bool FirstRunView::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;
+}
+
 }  // namespace chromeos