Ensure all ojluni Android-changed comments occur in line comments.

This brings the comments closer to the style guide and allows
automated extraction of the comment body.

After this CL, every occurence of "Android-" in a ojluni .java file
is in a line that contains a match for the regexp pattern:

"// (BEGIN |END |)Android-(?:changed|added|removed|note)(?:(?:: )?(.*))$"

Most of the previous violations of this rule were block comments that
should have been line comments (per the style guide), but there were
also some other occurence such as a reference to some other
"(Android-removed)" parts in prose, which was changed to
"(Android removed)".

There was a mix of:
 Android-removed: this debugging mechanism is not used in Android.
 Android-removed: this debugging mechanism is not used in Android
 Android-removed: this debugging mechanism is not supported in Android.

comments that were all normalized to:

// Android-removed: this debugging mechanism is not used in Android.

Test: Treehugger build succeeds
Test: Script (unsubmitted) does not find any occurences of "Android-"
      in ojluni .java files that do not match the above regex Pattern.
Bug: 35841464

Change-Id: Ib35bb1215d1fc29e82ba0a12f32c86423c737173
22 files changed