Move KeyLayoutMap from RefBase to shared_ptr.

Move KeyLayoutMap from inheriting RefBase and use shared_ptr
to store in owner class like KeyMap.

Bug: 160010896
Test: atest inputflinger, atest libinput_tests
Change-Id: I5caca94bfc4a7e038729479a53f09a89d97a1c23

tools/validatekeymaps/Main.cpp

@@ -96,10 +96,9 @@ static bool validateFile(const char* filename) {
         return false;
 
     case FILETYPE_KEYLAYOUT: {
-        sp<KeyLayoutMap> map;
-        status_t status = KeyLayoutMap::load(filename, &map);
-        if (status) {
-            error("Error %d parsing key layout file.\n\n", status);
+        base::Result<std::shared_ptr<KeyLayoutMap>> ret = KeyLayoutMap::load(filename);
+        if (!ret) {
+            error("Error %s parsing key layout file.\n\n", ret.error().message().c_str());
             return false;
         }
         break;