Remove IMM#getClient(), which is unused

InputMethodManager#getClient() is no longer marked as
@UnsupportedAppUsage [2] hence we should be able to remove it as far
as we can see.

Let's see how it goes.

  [1]: I47f3a5438bad6c8fa386b68ae7ac918a5c3e5d71
       835bc550

Bug: 192412909
Bug: 194333155
Test: presubmit
Change-Id: I1cfba4f4bd73672db7d264499f72546fc96db62f

parent 90164668

core/java/android/view/inputmethod/InputMethodManager.java

+0 −12

Original line number	Diff line number	Diff line
		@@ -1198,18 +1198,6 @@ public final class InputMethodManager {
		}
		}

		/**
		* No longer used. Do not use.
		*
		* TODO(b/192412909) Remove this method.
		*
		* @deprecated Was kept due to {@link UnsupportedAppUsage}. Will be removed soon.
		* @hide
		*/
		public IInputMethodClient getClient() {
		return mClient;
		}

		/**
		* Returns the list of installed input methods.
		*