Fixed a crash when extensions are not enabled.

chrome/browser/chrome_content_browser_client.cc

 // Copyright (c) 2012 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/chrome_content_browser_client.h"
 
 #include <set>
 #include <utility>
 #include <vector>
 
@@ skipping 2495 matching lines @@
 
 bool ChromeContentBrowserClient::AllowPepperSocketAPI(
     content::BrowserContext* browser_context,
     const GURL& url,
     bool private_api,
     const content::SocketPermissionRequest* params) {
 #if defined(ENABLE_PLUGINS)
   Profile* profile = Profile::FromBrowserContext(browser_context);
   const extensions::ExtensionSet* extension_set = NULL;
   if (profile) {
-    extension_set = extensions::ExtensionSystem::Get(profile)->
-        extension_service()->extensions();
+    const ExtensionService* ext_service =
+        extensions::ExtensionSystem::Get(profile)->extension_service();
+    if (ext_service) {
+      extension_set = ext_service->extensions();
+    }
   }
 
   if (private_api) {
     // Access to private socket APIs is controlled by the whitelist.
     if (IsExtensionOrSharedModuleWhitelisted(url, extension_set,
                                              allowed_socket_origins_)) {
       return true;
     }
   } else {
     // Access to public socket APIs is controlled by extension permissions.
@@ skipping 198 matching lines @@
   return new ChromeDevToolsManagerDelegate();
 }
 
 bool ChromeContentBrowserClient::IsPluginAllowedToCallRequestOSFileHandle(
     content::BrowserContext* browser_context,
     const GURL& url) {
 #if defined(ENABLE_PLUGINS)
   Profile* profile = Profile::FromBrowserContext(browser_context);
   const extensions::ExtensionSet* extension_set = NULL;
   if (profile) {
-    extension_set = extensions::ExtensionSystem::Get(profile)->
-        extension_service()->extensions();
+    const ExtensionService* ext_service =
+        extensions::ExtensionSystem::Get(profile)->extension_service();
+    if (ext_service) {
+      extension_set = ext_service->extensions();
+    }
   }
   return IsExtensionOrSharedModuleWhitelisted(url, extension_set,
                                               allowed_file_handle_origins_) ||
          IsHostAllowedByCommandLine(url, extension_set,
                                     switches::kAllowNaClFileHandleAPI);
 #else
   return false;
 #endif
 }
 
 bool ChromeContentBrowserClient::IsPluginAllowedToUseDevChannelAPIs(
     content::BrowserContext* browser_context,
     const GURL& url) {
 #if defined(ENABLE_PLUGINS)
   // Allow access for tests.
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnablePepperTesting)) {
     return true;
   }
 
   Profile* profile = Profile::FromBrowserContext(browser_context);
   const extensions::ExtensionSet* extension_set = NULL;
   if (profile) {
-    extension_set = extensions::ExtensionSystem::Get(profile)->
-        extension_service()->extensions();
+    const ExtensionService* ext_service =
+        extensions::ExtensionSystem::Get(profile)->extension_service();
+    if (ext_service) {
+      extension_set = ext_service->extensions();
+    }
   }
 
   // Allow access for whitelisted applications.
   if (IsExtensionOrSharedModuleWhitelisted(url,
                                            extension_set,
                                            allowed_dev_channel_origins_)) {
       return true;
   }
 
   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
@@ skipping 33 matching lines @@
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)
 
 }  // namespace chrome