Use the tonic namespace for tonic + resulting build fixes

tonic/dart_exception_factory.cc

 // 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.
 
 #include "tonic/dart_exception_factory.h"
 
 #include "tonic/dart_converter.h"
 #include "tonic/dart_builtin.h"
 
-namespace blink {
+namespace tonic {
 
 // TODO(johnmccutchan): Move this into another file.
 class StdStringBuilder {
  public:
   StdStringBuilder() {
   }
 
   void Append(const char* s, intptr_t length) {
     if (s == NULL) {
       return;
@@ skipping 90 matching lines @@
   if (core_library_.is_empty()) {
     Dart_Handle library = DartBuiltin::LookupLibrary("dart:core");
     core_library_.Set(dart_state_, library);
   }
 
   Dart_Handle exception_class = Dart_GetType(
       core_library_.value(), StdStringToDart(class_name), 0, 0);
   return Dart_New(exception_class, Dart_EmptyString(), 1, &message);
 }
 
-}  // namespace blink
+}  // namespace tonic