[Sync] Fix test support targets + duplicate namespaces.

components/sync/base/proto_value_ptr.h

 // Copyright 2015 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_BASE_PROTO_VALUE_PTR_H_
 #define COMPONENTS_SYNC_BASE_PROTO_VALUE_PTR_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 
 namespace syncer {
+
+class ProcessorEntityTracker;
 struct EntityData;
-class ProcessorEntityTracker;
-}  // namespace syncer
-
-namespace syncer {
 
 namespace syncable {
 struct EntryKernel;
 }  // namespace syncable
 
 // Default traits struct for ProtoValuePtr - adapts a
 // ::google::protobuf::MessageLite derived type to be used with ProtoValuePtr.
 template <typename T>
 struct DefaultProtoValuePtrTraits {
   // Deep copy the value from |src| to |dest|.
@@ skipping 96 matching lines @@
   void load(const void* blob, int length) {
     wrapper_ = Wrapper::ParseFromBlob(blob, length);
   }
 
   scoped_refptr<Wrapper> wrapper_;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_BASE_PROTO_VALUE_PTR_H_