Remove chromium_org and webview from the 64-bit blacklist.

external/chromium_org has been updated to handle 64-bit architectures
correctly in its makefiles; remove it from the blacklist so we can start
experimenting with building a 64/32 multilib version.

Change-Id: Ieb0e4f3cfea1578e01954c4656df90cd8d36b8cc
diff --git a/core/64_bit_blacklist.mk b/core/64_bit_blacklist.mk
index 8e5fb80..a237935 100644
--- a/core/64_bit_blacklist.mk
+++ b/core/64_bit_blacklist.mk
@@ -1,11 +1,9 @@
 ifneq ($(TARGET_2ND_ARCH),)
 
-# Chromium/V8: needs 64-bit support
+# chromium-libpac needs porting to the chromium_org V8 instead of legacy V8.
 _64_bit_directory_blacklist += \
 	external/chromium-libpac \
-	external/chromium_org \
 	external/v8 \
-	frameworks/webview \
 
 # misc build errors
 _64_bit_directory_blacklist += \