Allow multiple logging::LogMessage{Handler,Listener}s

components/crash/content/app/breakpad_mac.mm

 // Copyright 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.
 
 #import "components/crash/content/app/breakpad_mac.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 #import <Foundation/Foundation.h>
 #include <stddef.h>
 #include <string.h>
@@ skipping 246 matching lines @@
   base::debug::SetCrashKeyReportingFunctions(&SetCrashKeyValueImpl,
                                              &ClearCrashKeyValueImpl);
   GetCrashReporterClient()->RegisterCrashKeys();
 
   // Set Breakpad metadata values.  These values are added to Info.plist during
   // the branded Google Chrome.app build.
   SetCrashKeyValue(@"ver", [info_dictionary objectForKey:@BREAKPAD_VERSION]);
   SetCrashKeyValue(@"prod", [info_dictionary objectForKey:@BREAKPAD_PRODUCT]);
   SetCrashKeyValue(@"plat", @"OS X");
 
-  logging::SetLogMessageHandler(&FatalMessageHandler);
+  logging::PushLogMessageHandler(&FatalMessageHandler);
   base::debug::SetDumpWithoutCrashingFunction(&DumpHelper::DumpWithoutCrashing);
 
   // abort() sends SIGABRT, which breakpad does not intercept.
   // Register a signal handler to crash in a way breakpad will
   // intercept.
   struct sigaction sigact;
   memset(&sigact, 0, sizeof(sigact));
   sigact.sa_handler = SIGABRTHandler;
   CHECK(0 == sigaction(SIGABRT, &sigact, NULL));
 }
@@ skipping 11 matching lines @@
 
   // Store process type in crash dump.
   SetCrashKeyValue(@"ptype", process_type);
 
   NSString* pid_value =
       [NSString stringWithFormat:@"%d", static_cast<unsigned int>(getpid())];
   SetCrashKeyValue(@"pid", pid_value);
 }
 
 }  // namespace breakpad