Revert 269052 "Disable ICOImageDecoderTest.Decoding"

> Disable	ICOImageDecoderTest.Decoding
> 
> It fails on Windows.
> 
> BUG=371332
> TBR=pkasting@chromium.org
> 
> Review URL: https://codereview.chromium.org/270703007

TBR=marja@chromium.org

Review URL: https://codereview.chromium.org/284573002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269811 0039d316-1c4b-4281-b951-d872f2087c98

content/renderer/ico_image_decoder_unittest.cc

@@ -18,8 +18,7 @@ class ICOImageDecoderTest : public ImageDecoderTest {
   }
 };
 
-// crbug.com/371332
-TEST_F(ICOImageDecoderTest, DISABLED_Decoding) {
+TEST_F(ICOImageDecoderTest, Decoding) {
   TestDecoding();
 }