Made it possible to tell whether an extension is being installed or updated.

chrome/browser/extensions/webstore_startup_installer_browsertest.cc

Index: chrome/browser/extensions/webstore_startup_installer_browsertest.cc
diff --git a/chrome/browser/extensions/webstore_startup_installer_browsertest.cc b/chrome/browser/extensions/webstore_startup_installer_browsertest.cc
index 76b4ff17fb64d5d56cf8c579b5b8f171d1ad3cf8..8a02c4c5144da896b05a49d31cdb51fd2f42feb7 100644
--- a/chrome/browser/extensions/webstore_startup_installer_browsertest.cc
+++ b/chrome/browser/extensions/webstore_startup_installer_browsertest.cc
@@ -289,7 +289,9 @@ class CommandLineWebstoreInstall : public WebstoreStartupInstallerTest,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE {
     if (type == chrome::NOTIFICATION_EXTENSION_INSTALLED) {
-      const Extension* extension = content::Details<Extension>(details).ptr();
+      const Extension* extension =
+          content::Details<const extensions::InstalledExtensionInfo>(details)->
+              extension;
       ASSERT_TRUE(extension != NULL);
       EXPECT_EQ(extension->id(), kTestExtensionId);
       saw_install_ = true;