Remove unused tools and unused includes of SkImageDecoder

gyp/tools.gyp

Index: gyp/tools.gyp
diff --git a/gyp/tools.gyp b/gyp/tools.gyp
index 89e07a0a5b207032c24917a689fc3e286bd74ced..e60879bc5c0566991fb708e37a2d389ce322ac15 100644
--- a/gyp/tools.gyp
+++ b/gyp/tools.gyp
@@ -22,7 +22,6 @@
         'get_images_from_skps',
         'gpuveto',
         'imgblur',
-        'imgconv',
         'imgslice',
         'lua_app',
         'lua_pictures',
@@ -31,7 +30,6 @@
         'skhello',
         'skpinfo',
         'skpmaker',
-        'test_image_decoder',
         'test_public_includes',
         'whitelist_typefaces',
       ],
@@ -371,27 +369,6 @@
       ],
     },
     {
-      'target_name': 'imgconv',
-      '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': [