Fix Windows Condition Variable GetLastError Check

During the SleepConditionVariableCS days, the GetLastError was checked
against WAIT_TIMEOUT. This should have been ERROR_TIMEOUT per the docs.

WAIT_TIMEOUT applies to functions like WaitForSingleObject (and more).

BUG=619037

Review-Url: https://codereview.chromium.org/2053403002
Cr-Commit-Position: refs/heads/master@{#399279}

base/synchronization/condition_variable_win.cc

@@ -34,8 +34,8 @@ void ConditionVariable::TimedWait(const TimeDelta& max_time) {
   user_lock_->CheckHeldAndUnmark();
 #endif
 
-  if (FALSE == SleepConditionVariableSRW(&cv_, srwlock_, timeout, 0)) {
-    DCHECK(GetLastError() != WAIT_TIMEOUT);
+  if (!SleepConditionVariableSRW(&cv_, srwlock_, timeout, 0)) {
+    DCHECK_EQ(static_cast<DWORD>(ERROR_TIMEOUT), GetLastError());
   }
 
 #if DCHECK_IS_ON()