Switch ART to libc++.

TODO: remove all vestiges of stlport.

Change-Id: I95a3cb0b53d0898f0a5d388b606e79522f4d85e0
diff --git a/build/Android.gtest.mk b/build/Android.gtest.mk
index 1cd528b..8973aab 100644
--- a/build/Android.gtest.mk
+++ b/build/Android.gtest.mk
@@ -187,7 +187,7 @@
     LOCAL_CFLAGS += $(ART_TARGET_CFLAGS) $(ART_TARGET_DEBUG_CFLAGS)
     LOCAL_CFLAGS_x86 := $(ART_TARGET_CFLAGS_x86)
     LOCAL_SHARED_LIBRARIES += libdl libicuuc libicui18n libnativehelper libz libcutils libvixl
-    LOCAL_STATIC_LIBRARIES += libgtest
+    LOCAL_STATIC_LIBRARIES += libgtest_libc++
     LOCAL_MODULE_PATH_32 := $(ART_NATIVETEST_OUT)/$(ART_TARGET_ARCH_32)
     LOCAL_MODULE_PATH_64 := $(ART_NATIVETEST_OUT)/$(ART_TARGET_ARCH_64)
     LOCAL_MULTILIB := both