Make ExtensionService use ExtensionSet.

chrome/browser/extensions/network_delay_listener_unittest.cc

Index: chrome/browser/extensions/network_delay_listener_unittest.cc
diff --git a/chrome/browser/extensions/network_delay_listener_unittest.cc b/chrome/browser/extensions/network_delay_listener_unittest.cc
index b65ad0fdb863d5ce901fa7e78c67046e5fe7c81e..fcec6bf554f71927d7a0d0dfe080ae85c1d006ee 100644
--- a/chrome/browser/extensions/network_delay_listener_unittest.cc
+++ b/chrome/browser/extensions/network_delay_listener_unittest.cc
@@ -127,8 +127,8 @@ class NetworkDelayListenerTest
   void LoadTestExtension1() {
     LoadTestExtension(kTestExtensionId1);
     ASSERT_FALSE(service_->extensions()->empty());
-    extension1_ = service_->extensions()->at(0).get();
-    ASSERT_FALSE(extension1_ == NULL);
+    extension1_ = service_->extensions()->GetByID(kTestExtensionId1);
+    ASSERT_TRUE(extension1_);
   }
 
   void SendExtensionLoadedNotification(const Extension* extension) {
@@ -196,8 +196,9 @@ TEST_F(NetworkDelayListenerTest, TwoBlockingExtensions) {
   LoadTestExtension1();
   LoadTestExtension(kTestExtensionId2);
   ASSERT_EQ(2u, service_->extensions()->size());
-  const Extension* extension2 = service_->extensions()->at(1).get();
-  ASSERT_FALSE(extension2 == NULL);
+  const Extension* extension2 =
+      service_->extensions()->GetByID(kTestExtensionId2);
+  ASSERT_TRUE(extension2);
 
   TestDelegate delegate;
   scoped_ptr<TestURLRequest> request(StartTestRequest(&delegate, kTestUrl));