Unify the three places that patch font loading for PDFium on Windows.

content/child/child_message_filter.cc

Index: content/child/child_message_filter.cc
diff --git a/content/child/child_message_filter.cc b/content/child/child_message_filter.cc
index 9e5ff63e99a63816c9357034509a08f0abe06bbc..66b7555b376eb2be2350190697e9f8ce6110ae75 100644
--- a/content/child/child_message_filter.cc
+++ b/content/child/child_message_filter.cc
@@ -8,7 +8,7 @@
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/task_runner.h"
-#include "content/child/child_thread.h"
+#include "content/child/child_thread_impl.h"
 #include "content/child/thread_safe_sender.h"
 #include "ipc/message_filter.h"
 
@@ -52,7 +52,7 @@ base::TaskRunner* ChildMessageFilter::OverrideTaskRunnerForMessage(
 
 ChildMessageFilter::ChildMessageFilter()
     : internal_(NULL),
-      thread_safe_sender_(ChildThread::current()->thread_safe_sender()) {}
+      thread_safe_sender_(ChildThreadImpl::current()->thread_safe_sender()) {}
 
 ChildMessageFilter::~ChildMessageFilter() {}