Use css-device-adapt constraining for legacy viewport tags.

Source/core/core_derived_sources.gyp

 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 438 matching lines @@
               'css/themeChromium.css',
               'css/themeChromiumAndroid.css',
               'css/themeChromiumLinux.css',
               'css/themeChromiumSkia.css',
               'css/themeWin.css',
               'css/themeWinQuirks.css',
               'css/svg.css',
               'css/mediaControls.css',
               'css/mediaControlsAndroid.css',
               'css/fullscreen.css',
+              'css/xhtmlmp.css',
             ],
           },
           'inputs': [
             '<@(scripts)',
             '<@(stylesheets)'
           ],
           'outputs': [
             '<(SHARED_INTERMEDIATE_DIR)/blink/UserAgentStyleSheets.h',
             '<(SHARED_INTERMEDIATE_DIR)/blink/UserAgentStyleSheetsData.cpp',
           ],
@@ skipping 228 matching lines @@
             'scripts/make-hash-tools.pl',
             '<(SHARED_INTERMEDIATE_DIR)/blink',
             '<(RULE_INPUT_PATH)',
             '<(gperf_exe)',
           ],
         },
       ],
     },
   ],
 }