Fix remaining warnings for -Wmissing-braces and enable on win clang.

remoting/remoting_host_win.gypi

 # Copyright 2014 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.
 
 {
   'variables': {
     'remoting_host_installer_win_roots': [
       'host/installer/win/',
     ],
     'remoting_host_installer_win_files': [
@@ skipping 71 matching lines @@
         'ENTRY_PREFIX=Ps',
         'REGISTER_PROXY_DLL',
       ],
       'dependencies': [
         'remoting_lib_idl',
       ],
       'sources': [
         '<(SHARED_INTERMEDIATE_DIR)/remoting/host/chromoting_lib.dlldata.c',
         '<(SHARED_INTERMEDIATE_DIR)/remoting/host/chromoting_lib_p.c',
       ],
+      'variables': {
+        'clang_warning_flags': [
+          # MIDL generated code has a habit of omitting optional braces.
+          '-Wno-missing-braces',
+        ],
+      },
     },  # end of target 'remoting_lib_ps'
 
     # Regenerates 'chromoting_lib.rc' (used to embed 'chromoting_lib.tlb'
     # into remoting_core.dll's resources) every time
     # 'chromoting_lib_idl.templ' changes. Making remoting_core depend on
     # both this and 'remoting_lib_idl' targets ensures that the resorces
     # are rebuilt every time the type library is updated. GYP alone is
     # not smart enough to figure out this dependency on its own.
     {
       'target_name': 'remoting_lib_rc',
@@ skipping 520 matching lines @@
 
         {
           'target_name': 'remoting_me2me_host_archive',
           'type': 'none',
         },
       ],  # end of 'targets'
     }],  # 'wix_exists == "True" and sas_dll_exists == "True"'
 
   ],  # end of 'conditions'
 }