libweave: Remove reference to libchromeos

libchromeos is not used in libweave, so it should not be referenced
from the library's makefile.

BUG: 24872993
Change-Id: Ifd9a522d560d652e53fcc757769ae267b4e35eb1
Reviewed-on: https://weave-review.googlesource.com/1413
Reviewed-by: Vitaly Buka <vitalybuka@google.com>

libweave/Android.mk

diff --git a/libweave/Android.mk b/libweave/Android.mk
index 2f4eaed..36af7e2 100644
--- a/libweave/Android.mk
+++ b/libweave/Android.mk
@@ -186,7 +186,6 @@
 	libweave-external \
 	libweave-common \
 	libweave-test \
-	libchromeos-test-helpers \
 	libgtest libgmock \
 	libchrome_test_helpers \