Allow chrome.debugger API to attach to extension background pages.

chrome/browser/extensions/api/debugger/debugger_extension_apitest.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 "base/command_line.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/common/chrome_switches.h"
 
-class ExtensionTerminalPrivateApiTest : public ExtensionApiTest {
+class ExtensionApiTestWithSwitch : public ExtensionApiTest {
+ public:
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     ExtensionApiTest::SetUpCommandLine(command_line);
-    command_line->AppendSwitchASCII(
-        switches::kWhitelistedExtensionID, "kidcpjlbjdmcnmccjhjdckhbngnhnepk");
+    command_line->AppendSwitch(switches::kExtensionDebuggingSilent);
   }
 };
 
-IN_PROC_BROWSER_TEST_F(ExtensionTerminalPrivateApiTest, TerminalTest) {
-  EXPECT_TRUE(RunExtensionSubtest("terminal/component_extension", "test.html"))
-      << message_;
-};
+IN_PROC_BROWSER_TEST_F(ExtensionApiTestWithSwitch, ExtensionDebugger) {
+  ASSERT_TRUE(RunExtensionTest("debugger_extension")) << message_;
+}