Change name of extendable_buffer.h to buffer_with_... .

Bug: 6669677

Change-Id: Id2bd79d8f86c690d5c16d1ab726c5f6fa28ba5e3
diff --git a/native/jni/Android.mk b/native/jni/Android.mk
index e323742..3aa9738 100644
--- a/native/jni/Android.mk
+++ b/native/jni/Android.mk
@@ -79,8 +79,8 @@
         patricia_trie_policy.cpp \
         patricia_trie_reading_utils.cpp) \
     $(addprefix suggest/policyimpl/dictionary/utils/, \
+        buffer_with_extendable_buffer.cpp \
         byte_array_utils.cpp \
-        extendable_buffer.cpp \
         format_utils.cpp) \
     suggest/policyimpl/gesture/gesture_suggest_policy_factory.cpp \
     $(addprefix suggest/policyimpl/typing/, \