sync compositor: Remove camel casing

Didn't catch this in original review. Rename methods to match chrome
style.

BUG=636164

Review-Url: https://codereview.chromium.org/2455763002
Cr-Commit-Position: refs/heads/master@{#428048}
diff --git a/content/browser/android/synchronous_compositor_host.cc b/content/browser/android/synchronous_compositor_host.cc
index eb5a90f..7508aa3 100644
--- a/content/browser/android/synchronous_compositor_host.cc
+++ b/content/browser/android/synchronous_compositor_host.cc
@@ -108,7 +108,7 @@
     filter->SetFrameFuture(routing_id_, frame_future);
     sender_->Send(new SyncCompositorMsg_DemandDrawHwAsync(routing_id_, params));
   } else {
-    frame_future->setFrame(nullptr);
+    frame_future->SetFrame(nullptr);
   }
   return frame_future;
 }