Make UITest::CrashAwareSleep portable.

base/process_util_win.cc

Index: base/process_util_win.cc
diff --git a/base/process_util_win.cc b/base/process_util_win.cc
index 0ed5d86d58f5638cf9923dae6ad6b4f21c2f1932..9829a4143ab5278b485dec853fdcbabbd94385a7 100644
--- a/base/process_util_win.cc
+++ b/base/process_util_win.cc
@@ -353,6 +353,11 @@ bool WaitForSingleProcess(ProcessHandle handle, int wait_milliseconds) {
   return retval;
 }
 
+bool CrashAwareSleep(ProcessHandle handle, int wait_milliseconds) {
+  bool retval = WaitForSingleObject(handle, wait_milliseconds) == WAIT_TIMEOUT;
+  return retval;
+}
+
 bool CleanupProcesses(const std::wstring& executable_name,
                       int wait_milliseconds,
                       int exit_code,