Fix some clang warnings with -Wmissing-braces in base.

base/time/time_win.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.
 
 
 // Windows Timer Primer
 //
 // A good article:  http://www.ddj.com/windows/184416651
 // A good mozilla bug:  http://bugzilla.mozilla.org/show_bug.cgi?id=363258
 //
@@ skipping 410 matching lines @@
   QueryPerformanceCounter(&now);
   return QPCValueToTimeDelta(now.QuadPart);
 }
 
 bool IsBuggyAthlon(const base::CPU& cpu) {
   // On Athlon X2 CPUs (e.g. model 15) QueryPerformanceCounter is unreliable.
   return cpu.vendor_name() == "AuthenticAMD" && cpu.family() == 15;
 }
 
 void InitializeNowFunctionPointers() {
-  LARGE_INTEGER ticks_per_sec = {0};
+  LARGE_INTEGER ticks_per_sec = {};
   if (!QueryPerformanceFrequency(&ticks_per_sec))
     ticks_per_sec.QuadPart = 0;
 
   // If Windows cannot provide a QPC implementation, both TimeTicks::Now() and
   // TraceTicks::Now() must use the low-resolution clock.
   //
   // If the QPC implementation is expensive and/or unreliable, TimeTicks::Now()
   // will use the low-resolution clock, but TraceTicks::Now() will use the QPC
   // (in the hope that it is still useful for tracing purposes). A CPU lacking a
   // non-stop time counter will cause Windows to provide an alternate QPC
@@ skipping 79 matching lines @@
 TimeTicks TimeTicks::FromQPCValue(LONGLONG qpc_value) {
   return TimeTicks() + QPCValueToTimeDelta(qpc_value);
 }
 
 // TimeDelta ------------------------------------------------------------------
 
 // static
 TimeDelta TimeDelta::FromQPCValue(LONGLONG qpc_value) {
   return QPCValueToTimeDelta(qpc_value);
 }