[Sync] Convert sync to a static library.

components/sync/core/attachments/attachment_downloader_impl.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_CORE_ATTACHMENTS_ATTACHMENT_DOWNLOADER_IMPL_H_
 #define COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_DOWNLOADER_IMPL_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 86 matching lines @@
   void ReportResult(
       const DownloadState& download_state,
       const DownloadResult& result,
       const scoped_refptr<base::RefCountedString>& attachment_data);
 
   // Extract the crc32c from an X-Goog-Hash header in |headers|.
   //
   // Return true if a crc32c was found and useable for checking data integrity.
   // "Usable" means headers are present, there is "x-goog-hash" header with
   // "crc32c" hash in it, this hash is correctly base64 encoded 32 bit integer.
-  SYNC_EXPORT static bool ExtractCrc32c(const net::HttpResponseHeaders* headers,
-                                        uint32_t* crc32c);
+  static bool ExtractCrc32c(const net::HttpResponseHeaders* headers,
+                            uint32_t* crc32c);
 
   GURL sync_service_url_;
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
 
   std::string account_id_;
   OAuth2TokenService::ScopeSet oauth2_scopes_;
   scoped_refptr<OAuth2TokenServiceRequest::TokenServiceProvider>
       token_service_provider_;
   std::unique_ptr<OAuth2TokenService::Request> access_token_request_;
   std::string raw_store_birthday_;
 
   StateMap state_map_;
   // |requests_waiting_for_access_token_| only keeps references to DownloadState
   // objects while access token request is pending. It doesn't control objects'
   // lifetime.
   StateList requests_waiting_for_access_token_;
 
   ModelType model_type_;
 
   DISALLOW_COPY_AND_ASSIGN(AttachmentDownloaderImpl);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_DOWNLOADER_IMPL_H_