Revert "Remove external/chromium from the 64 bit blacklist."
Revert "Remove external/chromium from the 64 bit blacklist."

This reverts commit 27bf51144af3513605cff421beb39a556599eb42.

Change-Id: Ic7e4fff8f87342a248172c2fc0d1358b4db1c25c

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build