Use the tonic namespace for tonic + resulting build fixes

tonic/dart_timer_heap.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_timer_heap.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 #include "tonic/dart_api_scope.h"
 #include "tonic/dart_invoke.h"
 #include "tonic/dart_isolate_scope.h"
 #include "tonic/dart_state.h"
 
-namespace blink {
+namespace tonic {
 
 DartTimerHeap::DartTimerHeap() : next_timer_id_(1), weak_factory_(this) {
 }
 
 DartTimerHeap::~DartTimerHeap() {
 }
 
 int DartTimerHeap::Add(std::unique_ptr<Task> task) {
   int id = next_timer_id_++;
   Schedule(id, std::move(task));
@@ skipping 20 matching lines @@
   if (!task->closure.dart_state())
     return;
   DartIsolateScope scope(task->closure.dart_state()->isolate());
   DartApiScope api_scope;
   DartInvokeAppClosure(task->closure.value(), 0, nullptr);
   if (task->repeating)
     Schedule(id, std::move(task));
 }
 
 }