Use a temp directory for downloads in WebstoreInstaller tests.

chrome/browser/extensions/webstore_installer_test.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALLER_TEST_H_
 #define CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALLER_TEST_H_
 
 #include <string>
 
+#include "base/files/scoped_temp_dir.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "url/gurl.h"
 
 namespace base {
 class CommandLine;
 }  // namespace base
 
 class WebstoreInstallerTest : public InProcessBrowserTest {
  public:
   WebstoreInstallerTest(const std::string& webstore_domain,
                         const std::string& test_data_path,
                         const std::string& crx_filename,
                         const std::string& verified_domain,
                         const std::string& unverified_domain);
   virtual ~WebstoreInstallerTest();
 
   virtual void SetUpCommandLine(base::CommandLine* command_line) OVERRIDE;
   virtual void SetUpInProcessBrowserTestFixture() OVERRIDE;
+  virtual void SetUpOnMainThread() OVERRIDE;
 
  protected:
   GURL GenerateTestServerUrl(const std::string& domain,
                              const std::string& page_filename);
 
   void RunTest(const std::string& test_function_name);
 
   // Passes |i| to |test_function_name|, and expects that function to
   // return one of "FAILED", "KEEPGOING" or "DONE". KEEPGOING should be
   // returned if more tests remain to be run and the current test succeeded,
   // FAILED is returned when a test fails, and DONE is returned by the last
   // test if it succeeds.
   // This methods returns true iff there are more tests that need to be run.
   bool RunIndexedTest(const std::string& test_function_name, int i);
 
   // Runs a test without waiting for any results from the renderer.
   void RunTestAsync(const std::string& test_function_name);
 
   std::string webstore_domain_;
   std::string test_data_path_;
   std::string crx_filename_;
   std::string verified_domain_;
   std::string unverified_domain_;
   std::string test_gallery_url_;
+
+  base::ScopedTempDir download_directory_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALLER_TEST_H_