Rename libchromeos repo to libbrillo

Now that the former libchromeos repo sources are checked out at
external/libbrillo, update the include path for intermediates generated
for protobufs.

BUG: 24872993
Change-Id: I7e3dc205837e69c6ab355ea8b6dfc50ab22e0d24
diff --git a/Android.mk b/Android.mk
index 6485fd3..71f906e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -315,7 +315,7 @@
 LOCAL_SRC_FILES := $(libbrillo_test_sources)
 LOCAL_C_INCLUDES := \
     $(libbrillo_includes) \
-    $(generated_sources_dir)/proto/external/libchromeos
+    $(generated_sources_dir)/proto/external/libbrillo
 LOCAL_STATIC_LIBRARIES := libgtest libchrome_test_helpers \
     libbrillo-test-helpers libgmock libBionicGtestMain \
     libchrome_dbus_test_helpers