This change deletes a bunch of code that was used to conditionally show/hide
the keyboard app icon given system states and user preferences.

Bug 19001197.

Change-Id: I69a57aa21872a571af87a193b3e52b7f985e5168

Change-Id: Ib34931836a617d0dc049fb3c9ae6686374ec8c12

Bug: 17310080
Change-Id: I2b388772f269f1e7610a5bd32de80793da2df16e

With this CL, Intent#ACTION_MY_PACKAGE_REPLACED will
not only update the visibility of the setup activity but
also reconstruct additional subtypes.

This is important because the system always removes all
the additional subtypes whenever the package is updated.

BUG: 15890448
Change-Id: Ic36ea68f50b1ac89b4cbd268ee53f9a5e5d60afd

Change-Id: Id170dbfe2dcfc93130b7be4a84615940403ec37f

In setup wizard, InputMethodManager may not be able to be aware that
this IME is installed, especially just after the IME is installed via
GooglePlay app and hit the open button on the app to launch the setup
wizard.

Bug: 9299618
Change-Id: I00c8544178b41074253d49ae9481996ec56593d2

Change-Id: I803aa6c2160bfa1ffe992b28e7eb6e8a320c9762

Bug: 9054063
Change-Id: I092ab6e0077578d0aca57d2e41dfbc00b46e1ba4

Bug: 8239067
Change-Id: If6106a3632d3abad3e22ce29f1351525a5152ec7

The setup wizard icon will be hidden if the Android Keyboard is in
system image.

Bug: 8239067
Change-Id: Ib0c0c9e3a0954512c3e03e42a661cdf86eff0dca