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

ios/chrome/browser/crash_report/breakpad_helper.mm

 // 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 "ios/chrome/browser/crash_report/breakpad_helper.h"
 
 #import <Foundation/Foundation.h>
 #include <stddef.h>
 
 #include "base/auto_reset.h"
@@ skipping 60 matching lines @@
                           const base::StringPiece& value) {
   AddReportParameter(base::SysUTF8ToNSString(key.as_string()),
                      base::SysUTF8ToNSString(value.as_string()), true);
 }
 
 // Callback for base::debug::SetCrashKeyReportingFunctions
 void ClearCrashKeyValueImpl(const base::StringPiece& key) {
   RemoveReportParameter(base::SysUTF8ToNSString(key.as_string()));
 }
 
-// Callback for logging::SetLogMessageHandler
+// Callback for logging::PushLogMessageHandler
 bool FatalMessageHandler(int severity,
                          const char* file,
                          int line,
                          size_t message_start,
                          const std::string& str) {
   // Do not handle non-FATAL.
   if (severity != logging::LOG_FATAL)
     return false;
 
   // In case of OOM condition, this code could be reentered when
@@ skipping 31 matching lines @@
                   forKey:kCrashReportsUploadingEnabledKey];
 }
 
 }  // namespace
 
 void Start(const std::string& channel_name) {
   DCHECK(!g_crash_reporter_enabled);
   [[BreakpadController sharedInstance] start:YES];
   base::debug::SetCrashKeyReportingFunctions(&SetCrashKeyValueImpl,
                                              &ClearCrashKeyValueImpl);
-  logging::SetLogMessageHandler(&FatalMessageHandler);
+  logging::PushLogMessageHandler(&FatalMessageHandler);
   g_crash_reporter_enabled = true;
   // Register channel information.
   if (channel_name.length()) {
     AddReportParameter(@"channel", base::SysUTF8ToNSString(channel_name), true);
   }
   // Notifying the PathService on the location of the crashes so that crashes
   // can be displayed to the user on the about:crashes page.
   NSArray* cachesDirectories = NSSearchPathForDirectoriesInDomains(
       NSCachesDirectory, NSUserDomainMask, YES);
   NSString* cachePath = [cachesDirectories objectAtIndex:0];
@@ skipping 216 matching lines @@
 void RestoreDefaultConfiguration() {
   if (!g_crash_reporter_enabled)
     return;
   [[BreakpadController sharedInstance] stop];
   [[BreakpadController sharedInstance] resetConfiguration];
   [[BreakpadController sharedInstance] start:NO];
   [[BreakpadController sharedInstance] setUploadingEnabled:NO];
 }
 
 }  // namespace breakpad_helper