Reduce flakiness in chrome_frame_tests.exe by having each run in a clean environment.

chrome_frame/test/chrome_frame_test_utils.h

 // 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.
 
 #ifndef CHROME_FRAME_TEST_CHROME_FRAME_TEST_UTILS_H_
 #define CHROME_FRAME_TEST_CHROME_FRAME_TEST_UTILS_H_
 
 #include <windows.h>
 
 #include <atlbase.h>
@@ skipping 13 matching lines @@
 #include "chrome_frame/test/simulate_input.h"
 #include "chrome_frame/test_utils.h"
 #include "chrome_frame/utils.h"
 
 #include "gtest/gtest.h"
 
 // Needed for CreateFunctor.
 #define GMOCK_MUTANT_INCLUDE_LATE_OBJECT_BINDING
 #include "testing/gmock_mutant.h"
 
+class FilePath;
 interface IWebBrowser2;
 
 namespace chrome_frame_test {
 
 int CloseVisibleWindowsOnAllThreads(HANDLE process);
 
 base::ProcessHandle LaunchIE(const std::wstring& url);
-base::ProcessHandle LaunchChrome(const std::wstring& url);
+base::ProcessHandle LaunchChrome(const std::wstring& url,
+                                 const FilePath& user_data_dir);
 
 // Attempts to close all open IE windows.
 // The return value is the number of windows closed.
 // @note: this function requires COM to be initialized on the calling thread.
 // Since the caller might be running in either MTA or STA, the function does
 // not perform this initialization itself.
 int CloseAllIEWindows();
 
 extern const wchar_t kIEImageName[];
 extern const wchar_t kIEBrokerImageName[];
@@ skipping 277 matching lines @@
 }  // namespace chrome_frame_test
 
 // TODO(tommi): This is a temporary workaround while we're getting our
 // Singleton story straight.  Ideally each test should clear up any singletons
 // it might have created, but test cases do not implicitly have their own
 // AtExitManager, so we have this workaround method for tests that depend on
 // "fresh" singletons.  The implementation is in chrome_frame_unittest_main.cc.
 void DeleteAllSingletons();
 
 #endif  // CHROME_FRAME_TEST_CHROME_FRAME_TEST_UTILS_H_