Revert "Change the default for LOCAL_JAVA_LANGUAGE_VERSION from 1.7 to 1.8"

Reverting: broke the messaging app due to a recent change
there (commit 280a2fbe41f24eed11fcf5e13b803de17525b261).

This reverts commit dfcd9124880528a7bfbf9ba361b1a2040035ca06.

Change-Id: I055f35c0a7400ab2887c91d017eebaed1adaf972
1 file changed