Revert of Set crash key if WM_QUIT message is received on GPU message loop.

chrome/common/crash_keys.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 "chrome/common/crash_keys.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/format_macros.h"
 #include "base/logging.h"
@@ skipping 210 matching lines @@
     { "swdh_register_cannot_scope_url", crash_keys::kLargeSize },
     { "swdh_register_cannot_script_url", crash_keys::kLargeSize },
 
     // Temporary for https://crbug.com/619294.
     { "swdh_unregister_cannot_host_url", crash_keys::kLargeSize },
     { "swdh_unregister_cannot_scope_url", crash_keys::kLargeSize },
 
     // Temporary for https://crbug.com/630496.
     { "swdh_get_registration_cannot_host_url", crash_keys::kLargeSize },
     { "swdh_get_registration_cannot_document_url", crash_keys::kLargeSize },
-
-    // Temporary for https://crbug.com/647068.
-    { "received_quit_message", crash_keys::kSmallSize },
   };
 
   // This dynamic set of keys is used for sets of key value pairs when gathering
   // a collection of data, like command line switches or extension IDs.
   std::vector<base::debug::CrashKey> keys(
       fixed_keys, fixed_keys + arraysize(fixed_keys));
 
   crash_keys::GetCrashKeysForCommandLineSwitches(&keys);
 
   // Register the extension IDs.
@@ skipping 124 matching lines @@
 }
 
 ScopedPrinterInfo::~ScopedPrinterInfo() {
   for (size_t i = 0; i < kPrinterInfoCount; ++i) {
     std::string key = base::StringPrintf(kPrinterInfo, i + 1);
     base::debug::ClearCrashKey(key);
   }
 }
 
 }  // namespace crash_keys