Use the tonic namespace for tonic + resulting build fixes

tonic/dart_converter.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_CONVERTER_H_
 #define SKY_ENGINE_TONIC_DART_CONVERTER_H_
 
 #include <string>
 
 #include "tonic/dart_state.h"
 
-namespace blink {
+namespace tonic {
 
 // DartConvert converts types back and forth from Sky to Dart. The template
 // parameter |T| determines what kind of type conversion to perform.
 template <typename T, typename Enable = void>
 struct DartConverter {
 };
 
 // This is to work around the fact that typedefs do not create new types. If you
 // have a typedef, and want it to use a different converter, specialize this
 // template and override the types here.
@@ skipping 168 matching lines @@
   return std::string(reinterpret_cast<const char*>(data),
                      static_cast<size_t>(length));
 }
 
 
 // Alias Dart_NewStringFromCString for less typing.
 inline Dart_Handle ToDart(const char* val) {
   return Dart_NewStringFromCString(val);
 }
 
-}  // namespace blink
+}  // namespace tonic
 
 #endif  // SKY_ENGINE_TONIC_DART_CONVERTER_H_