[UMA] Use proper C++ objects to serialize tracked_objects across process boundaries.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 57edc18469aced0b955065a10dcb16a0352bf3ae..bb7d787be394951b013c6c2cbdef170bba919614 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -544,7 +544,8 @@ void RenderProcessHostImpl::CreateMessageFilters() {
       content::BrowserContext::GetQuotaManager(browser_context),
       content::GetContentClient()->browser()->CreateQuotaPermissionContext()));
   channel_->AddFilter(new content::GamepadBrowserMessageFilter(this));
-  channel_->AddFilter(new ProfilerMessageFilter());
+  channel_->AddFilter(new content::ProfilerMessageFilter(
+      content::PROCESS_TYPE_RENDERER));
 }
 
 int RenderProcessHostImpl::GetNextRoutingID() {