[Patch 3 of 6] Split out content/child's SiteIsolationPolicy into two new classes.

content/renderer/render_process_impl.cc

Index: content/renderer/render_process_impl.cc
diff --git a/content/renderer/render_process_impl.cc b/content/renderer/render_process_impl.cc
index 1f4dc4a35e0dd83dad2106a9272fc460ff3eee5b..6a01011c7c14d09342bd3dc2c8c09e6e01773ebe 100644
--- a/content/renderer/render_process_impl.cc
+++ b/content/renderer/render_process_impl.cc
@@ -57,9 +57,8 @@ RenderProcessImpl::RenderProcessImpl()
     v8::V8::SetFlagsFromString(flags.c_str(), static_cast<int>(flags.size()));
   }
 
-  // Turn on cross-site document blocking for renderer processes.
-  SiteIsolationPolicy::SetPolicyEnabled(
-      GetContentClient()->renderer()->ShouldEnableSiteIsolationPolicy());
+  SiteIsolationStatsGatherer::SetEnabled(
+      GetContentClient()->renderer()->ShouldGatherSiteIsolationStats());
 }
 
 RenderProcessImpl::~RenderProcessImpl() {