Revert of Make SkAndroidCodec support ico (patchset #7 id:130002 of https://codereview.chromium.org/1472933002/ )

Reason for revert:
Crashing: https://uberchromegw.corp.google.com/i/client.skia.android/builders/Test-Android-GCC-NexusPlayer-CPU-SSE4-x86-Release/builds/1499/steps/dm/logs/stdio

Also, related ASAN failures:
https://uberchromegw.corp.google.com/i/client.skia/builders/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-ASAN/builds/3676/steps/dm/logs/stdio

Original issue's description:
> Make SkAndroidCodec support ico
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/1603e9310f62cf0dd543cdb09dea06aa78373f13

TBR=djsollen@google.com,msarett@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1498903004
diff --git a/src/codec/SkAndroidCodec.cpp b/src/codec/SkAndroidCodec.cpp
index c26b3ef..cf6e253 100644
--- a/src/codec/SkAndroidCodec.cpp
+++ b/src/codec/SkAndroidCodec.cpp
@@ -34,9 +34,11 @@
         case kWBMP_SkEncodedFormat:
         case kBMP_SkEncodedFormat:
         case kGIF_SkEncodedFormat:
-        case kICO_SkEncodedFormat:
             return new SkSampledCodec(codec.detach());
         default:
+            // FIXME: SkSampledCodec is temporarily disabled for other formats
+            // while focusing on the formats that are supported by
+            // BitmapRegionDecoder.
             return nullptr;
     }
 }