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

webrtc/base/win32.h

Index: webrtc/base/win32.h
diff --git a/webrtc/base/win32.h b/webrtc/base/win32.h
index 1fc4221aec7e2174e4efcd233bc7a0da586fa879..9824f6b1dba451e18ec80f79b33738b447a7cf74 100644
--- a/webrtc/base/win32.h
+++ b/webrtc/base/win32.h
@@ -86,7 +86,7 @@ bool Utf8ToWindowsFilename(const std::string& utf8, std::wstring* filename);
 
 // Convert a FILETIME to a UInt64
 inline uint64 ToUInt64(const FILETIME& ft) {
-  ULARGE_INTEGER r = {ft.dwLowDateTime, ft.dwHighDateTime};
+  ULARGE_INTEGER r = {{ft.dwLowDateTime, ft.dwHighDateTime}};
   return r.QuadPart;
 }