Replace ASSERT with DCHECK in platform/

third_party/WebKit/Source/platform/WebThreadSupportingGC.h

 // Copyright 2014 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 WebThreadSupportingGC_h
 #define WebThreadSupportingGC_h
 
 #include <memory>
 #include "platform/WebTaskRunner.h"
 #include "platform/heap/GCTaskRunner.h"
@@ skipping 53 matching lines @@
   }
 
   void RemoveTaskObserver(WebThread::TaskObserver* observer) {
     thread_->RemoveTaskObserver(observer);
   }
 
   void Initialize();
   void Shutdown();
 
   WebThread& PlatformThread() const {
-    ASSERT(thread_);
+    DCHECK(thread_);
     return *thread_;
   }
 
  private:
   WebThreadSupportingGC(const char* name, WebThread*);
 
   std::unique_ptr<GCTaskRunner> gc_task_runner_;
 
   // m_thread is guaranteed to be non-null after this instance is constructed.
   // m_owningThread is non-null unless this instance is constructed for an
   // existing thread via createForThread().
   WebThread* thread_ = nullptr;
   std::unique_ptr<WebThread> owning_thread_;
 };
 
 }  // namespace blink
 
 #endif