[Sync] Clean up intra-sync DEPS significantly.

components/sync/engine/sync_string_conversions.cc

 // Copyright (c) 2012 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.
 
-#include "components/sync/base/sync_string_conversions.h"
+#include "components/sync/engine/sync_string_conversions.h"
 
 #define ENUM_CASE(x) \
   case x:            \
     return #x
 
 namespace syncer {
 
 const char* ConnectionStatusToString(ConnectionStatus status) {
   switch (status) {
     ENUM_CASE(CONNECTION_OK);
@@ skipping 33 matching lines @@
   switch (type) {
     ENUM_CASE(PASSPHRASE_BOOTSTRAP_TOKEN);
     ENUM_CASE(KEYSTORE_BOOTSTRAP_TOKEN);
     default:
       NOTREACHED();
       return "INVALID_BOOTSTRAP_TOKEN_TYPE";
   }
 }
 
 }  // namespace syncer