[Sync] Convert sync to a static library.

components/sync/engine_impl/directory_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_DIRECTORY_COMMIT_CONTRIBUTION_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_DIRECTORY_COMMIT_CONTRIBUTION_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "components/sync/base/model_type.h"
-#include "components/sync/base/sync_export.h"
 #include "components/sync/base/syncer_error.h"
 #include "components/sync/engine_impl/commit_contribution.h"
 #include "components/sync/protocol/sync.pb.h"
 #include "components/sync/sessions_impl/directory_type_debug_info_emitter.h"
 #include "components/sync/sessions_impl/status_controller.h"
 
 namespace syncer {
 
 namespace sessions {
 class StatusController;
 }  // namespace sessions
 
 namespace syncable {
 class Directory;
 }  // namespace syncable
 
 // This class represents a set of items belonging to a particular data type that
 // have been selected from the syncable Directory and prepared for commit.
 //
 // This class handles the bookkeeping related to the commit of these items,
 // including processing the commit response message and setting and unsetting
 // the SYNCING bits.
-class SYNC_EXPORT DirectoryCommitContribution : public CommitContribution {
+class DirectoryCommitContribution : public CommitContribution {
  public:
   // This destructor will DCHECK if UnsetSyncingBits() has not been called yet.
   ~DirectoryCommitContribution() override;
 
   // Build a CommitContribution from the IS_UNSYNCED items in |dir| with the
   // given |type|.  The contribution will include at most |max_items| entries.
   //
   // This function may return NULL if this type has no items ready for and
   // requiring commit.  This function may make model neutral changes to the
   // directory.
@@ skipping 55 matching lines @@
 
   // A pointer to the commit counters of our parent CommitContributor.
   DirectoryTypeDebugInfoEmitter* debug_info_emitter_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryCommitContribution);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_IMPL_DIRECTORY_COMMIT_CONTRIBUTION_H_