Revert of WIP: Added support for giflib, updated jpeg and png

platform_tools/chromeos/gyp/dependencies.gypi

+# This GYP file stores the dependencies necessary to build Skia on the Chrome OS
+# platform. The OS doesn't provide many stable libraries as part of the
+# distribution so we have to build a few of them ourselves.
+
+{
+  'variables': {
+    'skia_warnings_as_errors': 0,
+  },
+  'targets': [
+    {
+      'target_name': 'gif',
+      'type': 'static_library',
+      'sources': [
+        '../third_party/externals/gif/dgif_lib.c',
+        '../third_party/externals/gif/gifalloc.c',
+        '../third_party/externals/gif/gif_err.c',
+      ],
+      'include_dirs': [
+        '../third_party/externals/gif',
+      ],
+      'cflags': [
+        '-Wno-format',
+        '-DHAVE_CONFIG_H',
+      ],
+      'cflags!': [
+        '-Wall',
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '../third_party/externals/gif',
+        ],
+      }
+    },
+  ]
+}