Revert of tracing: add dump provider for malloc heap profiler

third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp

 // 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 "platform/heap/BlinkGCMemoryDumpProvider.h"
 
 #include "base/trace_event/heap_profiler_allocation_context_tracker.h"
 #include "base/trace_event/heap_profiler_allocation_register.h"
 #include "base/trace_event/trace_event_memory_overhead.h"
 #include "platform/heap/Handle.h"
@@ skipping 99 matching lines @@
 }
 
 BlinkGCMemoryDumpProvider::BlinkGCMemoryDumpProvider()
     : m_currentProcessMemoryDump(adoptPtr(new WebProcessMemoryDumpImpl()))
     , m_isHeapProfilingEnabled(false)
 {
 }
 
 void BlinkGCMemoryDumpProvider::insert(Address address, size_t size, const char* typeName)
 {
-    base::trace_event::AllocationContext context = base::trace_event::AllocationContextTracker::GetInstanceForCurrentThread()->GetContextSnapshot();
+    base::trace_event::AllocationContext context = base::trace_event::AllocationContextTracker::GetContextSnapshot();
     context.type_name = typeName;
     MutexLocker locker(m_allocationRegisterMutex);
     if (m_allocationRegister)
         m_allocationRegister->Insert(address, size, context);
 }
 
 void BlinkGCMemoryDumpProvider::remove(Address address)
 {
     MutexLocker locker(m_allocationRegisterMutex);
     if (m_allocationRegister)
         m_allocationRegister->Remove(address);
 }
 
 } // namespace blink