Revert "Bug 1146713 - export hardcoded gtk3 path in Android.mk"

Android.mk

@@ -1,11 +1,5 @@
 LOCAL_PATH:= $(call my-dir)
 
-# Workaround for CI server machine environment
-# Export a hardcode gtk3 path for emulator build. see also bug 1146713.
-ifneq (,$(TOOLTOOL_DIR))
-LD_LIBRARY_PATH := "$TOOLTOOL_DIR/gtk3/usr/local/lib:$(LD_LIBRARY_PATH)"
-endif
-
 #
 # Gaia glue
 #