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

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 876e8aef4049d58953e934bbce0bb9cfccad4cae..9ad8d4f92922142e792737f910e45028c65a0b6e 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -2041,13 +2041,13 @@ blink::WebServiceWorkerProvider* RenderFrameImpl::createServiceWorkerProvider(
   DCHECK(!frame_ || frame_ == frame);
   // At this point we should have non-null data source.
   DCHECK(frame->dataSource());
-  if (!ChildThread::current())
+  if (!ChildThreadImpl::current())
     return NULL;  // May be null in some tests.
   ServiceWorkerNetworkProvider* provider =
       ServiceWorkerNetworkProvider::FromDocumentState(
           DocumentState::FromDataSource(frame->dataSource()));
   return new WebServiceWorkerProviderImpl(
-      ChildThread::current()->thread_safe_sender(),
+      ChildThreadImpl::current()->thread_safe_sender(),
       provider ? provider->context() : NULL);
 }
 
@@ -3362,7 +3362,7 @@ void RenderFrameImpl::requestStorageQuota(
     callbacks.didFail(blink::WebStorageQuotaErrorAbort);
     return;
   }
-  ChildThread::current()->quota_dispatcher()->RequestStorageQuota(
+  ChildThreadImpl::current()->quota_dispatcher()->RequestStorageQuota(
       render_view_->GetRoutingID(),
       GURL(origin.toString()),
       static_cast<storage::StorageType>(type),