Disable off-store extension installs by default.

chrome/browser/ui/intents/web_intent_picker_controller_browsertest.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 <algorithm>
 #include <iterator>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 193 matching lines @@
 
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     // We start the test server now instead of in
     // SetUpInProcessBrowserTestFixture so that we can get its port number.
     ASSERT_TRUE(test_server()->Start());
 
     InProcessBrowserTest::SetUpCommandLine(command_line);
 
     net::HostPortPair host_port = test_server()->host_port_pair();
     command_line->AppendSwitchASCII(
+        switches::kAppsGalleryURL,
+        base::StringPrintf("http://www.example.com:%d", host_port.port()));
+    command_line->AppendSwitchASCII(
         switches::kAppsGalleryDownloadURL,
         base::StringPrintf(
             "http://www.example.com:%d/files/extensions/intents/%%s.crx",
             host_port.port()));
     command_line->AppendSwitchASCII(
         switches::kAppsGalleryInstallAutoConfirmForTests, "accept");
   }
 
   virtual void SetUpInProcessBrowserTestFixture() OVERRIDE {
     host_resolver()->AddRule("www.example.com", "127.0.0.1");
@@ skipping 369 matching lines @@
 
   EXPECT_EQ(2, picker_.num_installed_services_);
 
   // The tab is shown immediately without needing to call OnServiceChosen.
   ASSERT_EQ(2, browser()->tab_count());
   EXPECT_EQ(GURL(kServiceURL1),
             browser()->GetSelectedWebContents()->GetURL());
 
   EXPECT_TRUE(dispatcher.dispatched_);
 }