Move ServiceWorkerCache backend creation to a lazy init function.

content/browser/service_worker/service_worker_cache_unittest.cc

Index: content/browser/service_worker/service_worker_cache_unittest.cc
diff --git a/content/browser/service_worker/service_worker_cache_unittest.cc b/content/browser/service_worker/service_worker_cache_unittest.cc
index 5aa521bb85271e082f22ee038cb65c50acb65f98..4480dba9acf3c6b1d14a8273131a925bfd9573ae 100644
--- a/content/browser/service_worker/service_worker_cache_unittest.cc
+++ b/content/browser/service_worker/service_worker_cache_unittest.cc
@@ -76,7 +76,6 @@ class ServiceWorkerCacheTest : public testing::Test {
           url_request_context,
           blob_storage_context->context()->AsWeakPtr());
     }
-    CreateBackend();
   }
 
   virtual void TearDown() OVERRIDE {
@@ -123,15 +122,6 @@ class ServiceWorkerCacheTest : public testing::Test {
         GURL("http://example.com/no_body.html"), 200, "OK", headers, "");
   }
 
-  void CreateBackend() {
-    scoped_ptr<base::RunLoop> loop(new base::RunLoop());
-    cache_->CreateBackend(base::Bind(&ServiceWorkerCacheTest::ErrorTypeCallback,
-                                     base::Unretained(this),
-                                     base::Unretained(loop.get())));
-    loop->Run();
-    EXPECT_EQ(ServiceWorkerCache::ErrorTypeOK, callback_error_);
-  }
-
   scoped_ptr<ServiceWorkerFetchRequest> CopyFetchRequest(
       const ServiceWorkerFetchRequest& request) {
     return make_scoped_ptr(new ServiceWorkerFetchRequest(request.url,
@@ -293,7 +283,7 @@ TEST_P(ServiceWorkerCacheTestP, PutBody) {
   EXPECT_TRUE(Put(body_request_, body_response_));
 }
 
-TEST_P(ServiceWorkerCacheTestP, PutBodyDropBlobRef) {
+TEST_F(ServiceWorkerCacheTest, PutBodyDropBlobRef) {
   scoped_ptr<base::RunLoop> loop(new base::RunLoop());
   cache_->Put(CopyFetchRequest(body_request_),
               CopyFetchResponse(body_response_),