[Sync] SyncEngine refactor part 1: interfaces.

chrome/service/cloud_print/cloud_print_proxy_backend.h

Index: chrome/service/cloud_print/cloud_print_proxy_backend.h
diff --git a/chrome/service/cloud_print/cloud_print_proxy_backend.h b/chrome/service/cloud_print/cloud_print_proxy_backend.h
index babf456c89b4dd38c00d058d95e3a30a891c1bdc..251e52654a7903fa60613874a8beced68c74569e 100644
--- a/chrome/service/cloud_print/cloud_print_proxy_backend.h
+++ b/chrome/service/cloud_print/cloud_print_proxy_backend.h
@@ -47,7 +47,7 @@ class CloudPrintProxyFrontend {
   virtual void OnXmppPingUpdated(int ping_timeout) = 0;
 
  protected:
-  // Don't delete through SyncFrontend interface.
+  // Don't delete through CloudPrintProxyFrontend interface.
   virtual ~CloudPrintProxyFrontend() {}
 
  private:
@@ -79,7 +79,8 @@ class CloudPrintProxyBackend {
   bool PostCoreTask(const tracked_objects::Location& from_here,
                     const base::Closure& task);
 
-  // The real guts of SyncBackendHost, to keep the public client API clean.
+  // The real guts of CloudPrintProxyBackend, to keep the public client API
+  // clean.
   class Core;
 
   // A thread dedicated for use to perform initialization and authentication.
@@ -90,7 +91,7 @@ class CloudPrintProxyBackend {
   scoped_refptr<Core> core_;
 
   // A reference to the TaskRunner used to construct |this|, so we know how to
-  // safely talk back to the SyncFrontend.
+  // safely talk back to the CloudPrintProxyFrontend.
   const scoped_refptr<base::SingleThreadTaskRunner> frontend_task_runner_;
 
   // The frontend which is responsible for displaying UI and updating Prefs.