clang/win: Let some chromium_code targets build with -Wextra.

base/time/time_win_unittest.cc

 // 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.
 
 #include <windows.h>
 #include <mmsystem.h>
 #include <process.h>
 
 #include <cmath>
 #include <limits>
@@ skipping 132 matching lines @@
     }
   }
   EXPECT_TRUE(saw_submillisecond_timer);
 }
 
 TEST(TimeTicks, TimeGetTimeCaps) {
   // Test some basic assumptions that we expect about how timeGetDevCaps works.
 
   TIMECAPS caps;
   MMRESULT status = timeGetDevCaps(&caps, sizeof(caps));
-  EXPECT_EQ(TIMERR_NOERROR, status);
-  if (status != TIMERR_NOERROR) {
-    printf("Could not get timeGetDevCaps\n");
-    return;
-  }
+  ASSERT_EQ(static_cast<MMRESULT>(MMSYSERR_NOERROR), status);
 
   EXPECT_GE(static_cast<int>(caps.wPeriodMin), 1);
   EXPECT_GT(static_cast<int>(caps.wPeriodMax), 1);
   EXPECT_GE(static_cast<int>(caps.wPeriodMin), 1);
   EXPECT_GT(static_cast<int>(caps.wPeriodMax), 1);
   printf("timeGetTime range is %d to %dms\n", caps.wPeriodMin,
     caps.wPeriodMax);
 }
 
 TEST(TimeTicks, QueryPerformanceFrequency) {
@@ skipping 119 matching lines @@
         static_cast<double>((converted_value - TimeTicks()).InMicroseconds());
     EXPECT_NEAR(expected_microseconds_since_origin,
                 converted_microseconds_since_origin,
                 1.0)
         << "ticks=" << ticks << ", to be converted via logic path: "
         << (ticks < Time::kQPCOverflowThreshold ? "FAST" : "SAFE");
   }
 }
 
 }  // namespace base