Revert "adding OAuth library"

This reverts commit cc1aa994af5957815e47ec102a0eab3b98111eb1.
diff --git a/Android.mk b/Android.mk
index 369cdfd..f225ecd8 100644
--- a/Android.mk
+++ b/Android.mk
@@ -317,8 +317,7 @@
 	xml/src/main/java/org/w3c
 
 non_base_dirs := \
-	../../external/apache-http/src/org/apache/http \
-        ../../external/oauth/core/src/main/java/net/oauth
+	../../external/apache-http/src/org/apache/http
 
 # These are relative to frameworks/base
 dirs_to_document := \
@@ -549,7 +548,6 @@
 
 ext_dirs := \
 	../../external/apache-http/src \
-        ../../external/oauth/core/src/main/java \
 	../../external/tagsoup/src
 
 ext_src_files := $(call all-java-files-under,$(ext_dirs))