Remove Android-specific SK_SUPPORT_LEGACY_IMG_SNAPSHOT flag

Android has been updated to use the new signature so this should no longer be needed

Change-Id: Id745191e815381d032aba6a49bf4baf9c53b2385
Reviewed-on: https://skia-review.googlesource.com/9985
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed