[Sync] Convert sync to a static library.

components/sync/engine_impl/commit_contribution.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SYNC_ENGINE_IMPL_COMMIT_CONTRIBUTION_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_COMMIT_CONTRIBUTION_H_
 
 #include <stddef.h>
 
-#include "components/sync/base/sync_export.h"
 #include "components/sync/base/syncer_error.h"
 #include "components/sync/protocol/sync.pb.h"
 #include "components/sync/sessions_impl/status_controller.h"
 
 namespace syncer {
 
 namespace sessions {
 class StatusController;
 }  // namespace sessions
 
 // This class represents a set of items belonging to a particular data type that
 // have been selected from a CommitContributor and prepared for commit.
 //
 // This class handles the bookkeeping related to the commit of these items.
-class SYNC_EXPORT CommitContribution {
+class CommitContribution {
  public:
   CommitContribution();
   virtual ~CommitContribution() = 0;
 
   // Serialize this contribution's entries to the given commit request |msg|.
   //
   // This function is not const.  It may update some state in this contribution
   // that will be used when processing the associated commit response.  This
   // function should not be called more than once.
   virtual void AddToCommitMessage(sync_pb::ClientToServerMessage* msg) = 0;
@@ skipping 11 matching lines @@
   // before destruction.
   virtual void CleanUp() = 0;
 
   // Returns the number of entries included in this contribution.
   virtual size_t GetNumEntries() const = 0;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_IMPL_COMMIT_CONTRIBUTION_H_