Extract ProcessManager from ExtensionSystem.

chrome/browser/extensions/app_background_page_apitest.cc

Index: chrome/browser/extensions/app_background_page_apitest.cc
diff --git a/chrome/browser/extensions/app_background_page_apitest.cc b/chrome/browser/extensions/app_background_page_apitest.cc
index 20beade69dd010b088267814366523802c5bfd67..fc1ea8b31c108b8dcd54d65ac1722dc3f4ff6a75 100644
--- a/chrome/browser/extensions/app_background_page_apitest.cc
+++ b/chrome/browser/extensions/app_background_page_apitest.cc
@@ -614,7 +614,7 @@ IN_PROC_BROWSER_TEST_F(AppBackgroundPageNaClTest,
   ExtensionTestMessageListener nacl_modules_loaded("nacl_modules_loaded", true);
   LaunchTestingApp();
   extensions::ProcessManager* manager =
-    extensions::ExtensionSystem::Get(browser()->profile())->process_manager();
+      extensions::ProcessManager::Get(browser()->profile());
   ImpulseCallbackCounter active_impulse_counter(manager, extension()->id());
   EXPECT_TRUE(nacl_modules_loaded.WaitUntilSatisfied());
 
@@ -640,7 +640,7 @@ IN_PROC_BROWSER_TEST_F(AppBackgroundPageNaClTest,
   ExtensionTestMessageListener nacl_modules_loaded("nacl_modules_loaded", true);
   LaunchTestingApp();
   extensions::ProcessManager* manager =
-    extensions::ExtensionSystem::Get(browser()->profile())->process_manager();
+      extensions::ProcessManager::Get(browser()->profile());
   ImpulseCallbackCounter idle_impulse_counter(manager, extension()->id());
   EXPECT_TRUE(nacl_modules_loaded.WaitUntilSatisfied());