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

base/trace_event/trace_event_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.
 
 #include "base/trace_event/trace_event_win.h"
 
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include <initguid.h>  // NOLINT
 
 namespace base {
 namespace trace_event {
 
 using base::win::EtwEventType;
 using base::win::EtwMofEvent;
 
 // {3DADA31D-19EF-4dc1-B345-037927193422}
 const GUID kChromeTraceProviderName = {
-    0x3dada31d, 0x19ef, 0x4dc1, 0xb3, 0x45, 0x3, 0x79, 0x27, 0x19, 0x34, 0x22 };
+    0x3dada31d,
+    0x19ef,
+    0x4dc1,
+    {0xb3, 0x45, 0x3, 0x79, 0x27, 0x19, 0x34, 0x22}};
 
 // {B967AE67-BB22-49d7-9406-55D91EE1D560}
 const GUID kTraceEventClass32 = {
-    0xb967ae67, 0xbb22, 0x49d7, 0x94, 0x6, 0x55, 0xd9, 0x1e, 0xe1, 0xd5, 0x60 };
+    0xb967ae67,
+    0xbb22,
+    0x49d7,
+    {0x94, 0x6, 0x55, 0xd9, 0x1e, 0xe1, 0xd5, 0x60}};
 
 // {97BE602D-2930-4ac3-8046-B6763B631DFE}
 const GUID kTraceEventClass64 = {
-    0x97be602d, 0x2930, 0x4ac3, 0x80, 0x46, 0xb6, 0x76, 0x3b, 0x63, 0x1d, 0xfe};
-
+    0x97be602d,
+    0x2930,
+    0x4ac3,
+    {0x80, 0x46, 0xb6, 0x76, 0x3b, 0x63, 0x1d, 0xfe}};
 
 TraceEventETWProvider::TraceEventETWProvider() :
     EtwTraceProvider(kChromeTraceProviderName) {
   Register();
 }
 
 TraceEventETWProvider* TraceEventETWProvider::GetInstance() {
   return Singleton<TraceEventETWProvider,
       StaticMemorySingletonTraits<TraceEventETWProvider> >::get();
 }
@@ skipping 76 matching lines @@
     provider->TraceEvent(name, name_len, type, id, extra, extra_len);
   }
 }
 
 void TraceEventETWProvider::Resurrect() {
   StaticMemorySingletonTraits<TraceEventETWProvider>::Resurrect();
 }
 
 }  // namespace trace_event
 }  // namespace base