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

chrome_frame/test/run_all_unittests.cc

Index: chrome_frame/test/run_all_unittests.cc
diff --git a/chrome_frame/test/run_all_unittests.cc b/chrome_frame/test/run_all_unittests.cc
index de66ba1de921849e800c4928c4a09db0dd011976..defc8802b8fe4d2124e4209a787cb99409520056 100644
--- a/chrome_frame/test/run_all_unittests.cc
+++ b/chrome_frame/test/run_all_unittests.cc
@@ -13,6 +13,7 @@
 #include "chrome_frame/crash_server_init.h"
 #include "chrome_frame/test/chrome_frame_test_utils.h"
 #include "chrome_frame/test/chrome_frame_ui_test_utils.h"
+#include "chrome_frame/test/test_scrubber.h"
 #include "chrome_frame/test_utils.h"
 #include "chrome_frame/utils.h"
 
@@ -61,6 +62,8 @@ int main(int argc, char **argv) {
     breakpad.reset(InitializeCrashReporting(HEADLESS));
   }
 
+  chrome_frame_test::InstallTestScrubber(testing::UnitTest::GetInstance());
+
   int ret = -1;
   // If mini_installer is used to register CF, we use the switch
   // --no-registration to avoid repetitive registration.