Autoplay: fixes IPC traits for WebPreferences.

Bug: 726334
Change-Id: If9232ab19e8bd3e39732aa7ee5944b6d6e9298bb
Reviewed-on: https://chromium-review.googlesource.com/520042Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#476316}

content/public/common/common_param_traits_macros.h

@@ -78,9 +78,10 @@ IPC_ENUM_TRAITS_MIN_MAX_VALUE(content::ImageAnimationPolicy,
 IPC_ENUM_TRAITS_MIN_MAX_VALUE(content::ViewportStyle,
                               content::ViewportStyle::DEFAULT,
                               content::ViewportStyle::LAST)
-IPC_ENUM_TRAITS_MIN_MAX_VALUE(content::AutoplayPolicy,
+IPC_ENUM_TRAITS_MIN_MAX_VALUE(
+    content::AutoplayPolicy,
     content::AutoplayPolicy::kNoUserGestureRequired,
-                              content::AutoplayPolicy::kUserGestureRequired)
+    content::AutoplayPolicy::kUserGestureRequiredForCrossOrigin)
 
 IPC_STRUCT_TRAITS_BEGIN(blink::WebPoint)
   IPC_STRUCT_TRAITS_MEMBER(x)