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

This reverts commit 27bf51144af3513605cff421beb39a556599eb42.

Change-Id: Ic7e4fff8f87342a248172c2fc0d1358b4db1c25c
diff --git a/core/64_bit_blacklist.mk b/core/64_bit_blacklist.mk
index ab081b5..9f16536 100644
--- a/core/64_bit_blacklist.mk
+++ b/core/64_bit_blacklist.mk
@@ -8,6 +8,7 @@
 
 # Chromium/V8: needs 64-bit support
 _64_bit_directory_blacklist += \
+	external/chromium \
 	external/chromium-libpac \
 	external/chromium_org \
 	external/v8 \