Make gtk2/gtk3 compile time switchable.

gpu/gles2_conform_support/gles2_conform_test.gyp

 # Copyright (c) 2013 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.
 
 {
 
   'includes': [
     'gles2_conform.gypi',
   ],
   'target_defaults': {
@@ skipping 90 matching lines @@
             'gles2_conform_test_embedded_data',
             '<(DEPTH)/gpu/gles2_conform_support/gles2_conform_support.gyp:egl_native',
             '<(DEPTH)/gpu/gles2_conform_support/gles2_conform_support.gyp:egl_main_windowless',
             '<(DEPTH)/gpu/gpu.gyp:gles2_c_lib_nocheck',
             '<(DEPTH)/third_party/expat/expat.gyp:expat',
           ],
           'conditions': [
             ['OS=="linux"', {
               'conditions': [
                 [ 'chromeos==0', {
-                  'dependencies': ['../../build/linux/system.gyp:gtk']
+                  'dependencies': ['../../build/linux/system.gyp:gtk2']
                 }],
                 [ 'clang==1', {
                   'cflags': [
                     '-Wno-array-bounds',
                     '-Wno-implicit-function-declaration',
                     '-Wno-incompatible-pointer-types',
                     '-Wno-parentheses-equality',
                     '-Wno-pointer-sign',
                     '-Wno-return-type',
                     '-Wno-sizeof-pointer-memaccess',
@@ skipping 129 matching lines @@
     }],
   ],
 }
 
 
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