Use the tonic namespace for tonic + resulting build fixes

tonic/dart_wrappable.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_WRAPPABLE_H_
 #define SKY_ENGINE_TONIC_DART_WRAPPABLE_H_
 
 #include "base/logging.h"
 #include "base/template_util.h"
 #include "dart/runtime/include/dart_api.h"
 #include "tonic/dart_converter.h"
 #include "tonic/dart_error.h"
 #include "tonic/dart_state.h"
 #include "tonic/dart_wrapper_info.h"
 
-namespace blink {
+namespace tonic {
 class DartGCVisitor;
 struct DartWrapperInfo;
 
 // DartWrappable is a base class that you can inherit from in order to be
 // exposed to Dart code as an interface.
 class DartWrappable {
  public:
   enum DartNativeFields {
     kPeerIndex,  // Must be first to work with Dart_GetNativeReceiver.
     kWrapperInfoIndex,
@@ skipping 96 matching lines @@
 };
 
 template<typename T>
 inline T* GetReceiver(Dart_NativeArguments args) {
   intptr_t receiver;
   Dart_Handle result = Dart_GetNativeReceiver(args, &receiver);
   DCHECK(!Dart_IsError(result));
   return static_cast<T*>(reinterpret_cast<DartWrappable*>(receiver));
 }
 
-}  // namespace blink
+}  // namespace tonic
 
 #endif  // SKY_ENGINE_TONIC_DART_WRAPPABLE_H_