Enable GuestViewCrossProcessFrames experiment by default.

Bug: 655753
Change-Id: If5466905c2dcb876ae6374f683c2f8ad29fe5859
Reviewed-on: https://chromium-review.googlesource.com/680158Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Lucas Gadani <lfg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504422}

content/public/common/content_features.cc

@@ -115,7 +115,7 @@ const base::Feature kGamepadExtensions{"GamepadExtensions",
 // Causes the implementations of guests (inner WebContents) to use
 // out-of-process iframes.
 const base::Feature kGuestViewCrossProcessFrames{
-    "GuestViewCrossProcessFrames", base::FEATURE_DISABLED_BY_DEFAULT};
+    "GuestViewCrossProcessFrames", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables BlinkGC heap compaction.
 const base::Feature kHeapCompaction{"HeapCompaction",