[Extensions] Update ExtensionService references in c/b/task_manager

Update references to ExtensionService in c/b/task_manager to use
extensions::ExtensionService.

There should be no behavior change as a result of this CL.

Bug: 117261
Change-Id: I18111ab851102ba21239b4ae7b7ee54ec0fc1076
Reviewed-on: https://chromium-review.googlesource.com/1080021Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563047}

chrome/browser/task_manager/task_manager_browsertest.cc

@@ -406,8 +406,9 @@ IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, NoticeAppTabChanges) {
   ShowTaskManager();
 
   ASSERT_TRUE(LoadExtension(test_data_dir_.AppendASCII("packaged_app")));
-  ExtensionService* service = extensions::ExtensionSystem::Get(
-                                  browser()->profile())->extension_service();
+  extensions::ExtensionService* service =
+      extensions::ExtensionSystem::Get(browser()->profile())
+          ->extension_service();
   const extensions::Extension* extension =
       service->GetExtensionById(last_loaded_extension_id(), false);
 
@@ -448,8 +449,9 @@ IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, NoticeAppTabChanges) {
 IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, NoticeAppTab) {
   ASSERT_TRUE(LoadExtension(
       test_data_dir_.AppendASCII("packaged_app")));
-  ExtensionService* service = extensions::ExtensionSystem::Get(
-      browser()->profile())->extension_service();
+  extensions::ExtensionService* service =
+      extensions::ExtensionSystem::Get(browser()->profile())
+          ->extension_service();
   const extensions::Extension* extension =
       service->GetExtensionById(last_loaded_extension_id(), false);