Revert "Increase the maximum javac heap size."

This reverts commit c0c8caccd270a9f2b9054de6d6c8d6ca9fe4af2f.

Change-Id: I48fc2e0205a9e2ffed3652d8f7a8dd56a28da2a1
Revert "Add support for ALTERNATE_JAVAC"

This reverts commit 59f45b98bbb1aadfdde036f769e8ae3ac910faec.

Change-Id: Iba9b8fec51f0c065bd7267b9d590f4107d85174d