Use the tonic namespace for tonic + resulting build fixes

tonic/dart_string_cache.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 SKY_ENGINE_TONIC_DART_STRING_CACHE_H_
 #define SKY_ENGINE_TONIC_DART_STRING_CACHE_H_
 
 #include "base/logging.h"
 #include "dart/runtime/include/dart_api.h"
 #include "sky/engine/wtf/HashMap.h"
 #include "sky/engine/wtf/RefPtr.h"
 #include "sky/engine/wtf/text/StringHash.h"
 #include "sky/engine/wtf/text/StringImpl.h"
 
-namespace blink {
+namespace tonic {
 
 // DartStringCache maintains a mapping between WTF Strings and Dart strings.
 // When you create a Dart string from a WTF String, the underlying character
 // data is shared between the two systems.
 class DartStringCache {
  public:
   DartStringCache();
   ~DartStringCache();
 
   Dart_WeakPersistentHandle Get(StringImpl* string_impl,
@@ skipping 10 matching lines @@
 
   typedef HashMap<StringImpl*, Dart_WeakPersistentHandle> StringCache;
 
   StringCache cache_;
   Dart_WeakPersistentHandle last_dart_string_;
   RefPtr<StringImpl> last_string_impl_;
 
   DISALLOW_COPY_AND_ASSIGN(DartStringCache);
 };
 
-}  // namespace blink
+}  // namespace tonic
 
 #endif  // SKY_ENGINE_TONIC_DART_STRING_CACHE_H_