Revert "Allow MessageFilters to restrict listening to specific message classes"

content/browser/renderer_host/memory_benchmark_message_filter.cc

 // Copyright (c) 2013 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 "content/browser/renderer_host/memory_benchmark_message_filter.h"
 
 #include "content/common/memory_benchmark_messages.h"
 
 #if defined(USE_TCMALLOC) && (defined(OS_LINUX) || defined(OS_ANDROID))
 
 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 
 namespace content {
 
-MemoryBenchmarkMessageFilter::MemoryBenchmarkMessageFilter()
-    : BrowserMessageFilter(MemoryBenchmarkMsgStart) {
+MemoryBenchmarkMessageFilter::MemoryBenchmarkMessageFilter() {
 }
 
 bool MemoryBenchmarkMessageFilter::OnMessageReceived(
     const IPC::Message& message,
     bool* message_was_ok) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(MemoryBenchmarkMessageFilter,
                            message,
                            *message_was_ok)
     IPC_MESSAGE_HANDLER(MemoryBenchmarkHostMsg_HeapProfilerDump,
                         OnHeapProfilerDump)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 MemoryBenchmarkMessageFilter::~MemoryBenchmarkMessageFilter() {
 }
 
 void MemoryBenchmarkMessageFilter::OnHeapProfilerDump(
     const std::string& reason) {
   ::HeapProfilerDump(reason.c_str());
 }
 
 }  // namespace content
 
 #endif  // defined(USE_TCMALLOC) && (defined(OS_LINUX) || defined(OS_ANDROID))