Move ExtensionServiceTestBase into it's own header/cc file

extensions/browser/lazy_background_task_queue_unittest.cc

Index: extensions/browser/lazy_background_task_queue_unittest.cc
diff --git a/extensions/browser/lazy_background_task_queue_unittest.cc b/extensions/browser/lazy_background_task_queue_unittest.cc
index 939d74b67e78185e89af55754997f5a8e797ca81..0a991b4d09d3502043fef8188d7bebf0dab06ff6 100644
--- a/extensions/browser/lazy_background_task_queue_unittest.cc
+++ b/extensions/browser/lazy_background_task_queue_unittest.cc
@@ -6,7 +6,8 @@
 
 #include "base/bind.h"
 #include "base/command_line.h"
-#include "chrome/browser/extensions/extension_service_unittest.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/extension_service_test_base.h"
 #include "chrome/browser/extensions/test_extension_system.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/test_browser_thread_bundle.h"
@@ -43,7 +44,8 @@ class TestProcessManager : public ProcessManager {
 
 // Derives from ExtensionServiceTestBase because ExtensionService is difficult
 // to initialize alone.
-class LazyBackgroundTaskQueueTest : public ExtensionServiceTestBase {
+class LazyBackgroundTaskQueueTest
+    : public extensions::ExtensionServiceTestBase {
  public:
   LazyBackgroundTaskQueueTest() : task_run_count_(0) {}
   virtual ~LazyBackgroundTaskQueueTest() {}