Move non-API code out of sync/api/attachments/

chrome/browser/DEPS

 include_rules = [
   "+apps",
   "+ash",
   "+chrome/app",
   "+chrome/installer",
   "+chrome_elf/blacklist",
   "+chrome_elf/chrome_elf_constants.h",
   "+chrome_elf/create_file",
   "+chrome_elf/dll_hash",
   "+chromeos",
@@ skipping 73 matching lines @@
   "+ppapi/c",  # For various types.
   "+ppapi/host",
   "+ppapi/proxy",
   "+ppapi/shared_impl",
   # Defines some types that are marshalled over IPC.
   "+ppapi/shared_impl/ppp_flash_browser_operations_shared.h",
   "+rlz",
   "+sandbox/win/src",  # The path doesn't say it, but this is the Windows sandbox.
   "+skia/ext",
   "+sync/api",  # Sync API files.
+  "+sync/internal_api/public/attachments",  # Needed for tests.
   "+sync/protocol",  # Sync protobuf files.
   "+third_party/cros_system_api",
   "+win8/util",
 
   # chrome only needs switches from cc. All usage of the compositor is from
   # content. Definitely don't include generic stuff from cc/base here, if this
   # is needed these files need to move to base/
   "+cc/base/switches.h",
 
   # Unsafe to use from //chrome, see http://goo.gl/QQG5wo
@@ skipping 37 matching lines @@
   "+third_party/WebKit/public/web/WebCache.h",
   "+third_party/WebKit/public/web/WebContextMenuData.h",
   "+third_party/WebKit/public/web/WebFindOptions.h",
   "+third_party/WebKit/public/web/WebInputEvent.h",
   "+third_party/WebKit/public/web/WebMediaPlayerAction.h",
   "+third_party/WebKit/public/web/WebPageVisibilityState.h",
   "+third_party/WebKit/public/web/WebPluginAction.h",
   "+third_party/WebKit/public/web/WebTextDirection.h",
   "+third_party/WebKit/public/web/WebWindowFeatures.h",
 ]