Fixed extension sync-related crash in ChromeUrlRequestContext

chrome/browser/net/chrome_url_request_context.cc

 // Copyright (c) 2010 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/browser/net/chrome_url_request_context.h"
 
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/message_loop_proxy.h"
 #include "base/string_util.h"
@@ skipping 823 matching lines @@
                                               ExtensionInfo* info) {
   if (!is_off_the_record_)
     extension_info_[id] = linked_ptr<ExtensionInfo>(info);
 }
 
 void ChromeURLRequestContext::OnUnloadedExtension(const std::string& id) {
   CheckCurrentlyOnIOThread();
   if (is_off_the_record_)
     return;
   ExtensionInfoMap::iterator iter = extension_info_.find(id);
-  DCHECK(iter != extension_info_.end());
-  extension_info_.erase(iter);
+  if (iter != extension_info_.end()) {
+    extension_info_.erase(iter);
+  } else {
+    // NOTE: This can currently happen if we receive multiple unload
+    // notifications, e.g. setting incognito-enabled state for a
+    // disabled extension (e.g., via sync).  See
+    // http://code.google.com/p/chromium/issues/detail?id=50582 .
+    NOTREACHED() << id;
+  }
 }
 
 bool ChromeURLRequestContext::AreCookiesEnabled() const {
   ContentSetting setting =
       host_content_settings_map_->GetDefaultContentSetting(
           CONTENT_SETTINGS_TYPE_COOKIES);
   return setting != CONTENT_SETTING_BLOCK;
 }
 
 ChromeURLRequestContext::ChromeURLRequestContext(
@@ skipping 184 matching lines @@
       prefs::kProxyAutoDetect));
 
   if (pref_service->HasPrefPath(prefs::kProxyBypassList)) {
     std::string proxy_bypass =
         pref_service->GetString(prefs::kProxyBypassList);
     proxy_config->proxy_rules().bypass_rules.ParseFromString(proxy_bypass);
   }
 
   return proxy_config;
 }