Remove unused tools and unused includes of SkImageDecoder

gyp/tools.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
     # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
@@ skipping 13 matching lines @@
         'imgblur',
         'imgconv',
         'imgslice',
         'lua_app',
         'lua_pictures',
         'pinspect',
         'skdiff',
         'skhello',
         'skpinfo',
         'skpmaker',
-        'test_image_decoder',
         'test_public_includes',
         'whitelist_typefaces',
       ],
       'conditions': [
         ['skia_shared_lib',
           {
             'dependencies': [
               'sklua', # This can only be built if skia is built as a shared library
             ],
           },
@@ skipping 330 matching lines @@
       'type': 'executable',
       'sources': [
         '../tools/imgconv.cpp',
       ],
       'dependencies': [
         'flags.gyp:flags',
         'skia_lib.gyp:skia_lib',
       ],
     },
     {
-      'target_name': 'test_image_decoder',
-      'type': 'executable',
-      'sources': [
-        '../tools/test_image_decoder.cpp',
-      ],
-      'dependencies': [
-        'skia_lib.gyp:skia_lib',
-      ],
-    },
-    {
       'target_name': 'proc_stats',
       'type': 'static_library',
       'sources': [
         '../tools/ProcStats.h',
         '../tools/ProcStats.cpp',
       ],
       'direct_dependent_settings': {
         'include_dirs': [ '../tools', ],
       },
     },
@@ skipping 197 matching lines @@
               'flags.gyp:flags',
               'skia_lib.gyp:skia_lib',
               'resources',
             ],
           },
         ],
       },
     ],
   ],
 }