Get rid of setVisibility hack and use onVisibilityChange callback instead

onVisibilityChange was not available as of API Level 7 but we don't need to that workaround anymore.  No behavior change is intended in the supported platforms.

BUG=none
TEST=compile

git-svn-id: https://mozc.googlecode.com/svn/trunk@401 a6090854-d499-a067-5803-1114d4e51264
5 files changed
tree: d15f7beb1251b17f92f71d14c172e62a957126bb
  1. src/