Allow building without SVG.

build/features_override.gypi

 # Copyright (c) 2009 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.
 
 # This file is only included in full-chromium builds, and overrides the
 # feature_defines variable in third_party/WebKit/WebKit/chromium/features.gypi.
 {
   'variables': {
     # WARNING: This list of strings completely replaces the list in
     # features.gypi. Therefore, if an enable is listed in features.gypi
@@ skipping 13 matching lines @@
       'ENABLE_JSC_MULTIPLE_THREADS=0',
       'ENABLE_ICONDATABASE=0',
       'ENABLE_NOTIFICATIONS=1',
       'ENABLE_OPENTYPE_SANITIZER=1',
       'ENABLE_ORIENTATION_EVENTS=0',
       'ENABLE_RUBY=1',
       'ENABLE_SANDBOX=1',
       'ENABLE_XSLT=1',
       'ENABLE_XPATH=1',
       'ENABLE_SHARED_WORKERS=1',
-      'ENABLE_SVG=1',
-      'ENABLE_SVG_ANIMATION=1',
-      'ENABLE_SVG_AS_IMAGE=1',
-      'ENABLE_SVG_USE=1',
-      'ENABLE_SVG_FOREIGN_OBJECT=1',
-      'ENABLE_SVG_FONTS=1',
+      'ENABLE_SVG=<(enable_svg)',
+      'ENABLE_SVG_ANIMATION=<(enable_svg)',
+      'ENABLE_SVG_AS_IMAGE=<(enable_svg)',
+      'ENABLE_SVG_USE=<(enable_svg)',
+      'ENABLE_SVG_FOREIGN_OBJECT=<(enable_svg)',
+      'ENABLE_SVG_FONTS=<(enable_svg)',
       'ENABLE_VIDEO=1',
       'ENABLE_WEB_SOCKETS=1',
       'ENABLE_WORKERS=1',
     ],
     # We have to nest variables inside variables so that they can be overridden
     # through GYP_DEFINES.
     'variables': {
-      'use_accelerated_compositing%':0,
+      'use_accelerated_compositing%': 0,
+      'enable_svg%': 1,
     },
     'use_accelerated_compositing%': '<(use_accelerated_compositing)',
+    'enable_svg%': '<(enable_svg)',
     'conditions': [
       ['use_accelerated_compositing==1', {
         'feature_defines': ['WTF_USE_ACCELERATED_COMPOSITING=1'],
       }],
     ],
     # TODO: If the need arises, create a mechanism that will intelligently
     # merge the lists rather than replace one with the other. This may
     # require changes in gyp.
   },
 
 }
 
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