Use String8/16 c_str [media]

Bug: 295394788
Test: make checkbuild
Change-Id: I4ba5400f39c769bec59508525844f1daefe1d15c
diff --git a/media/libmediaplayerservice/MetadataRetrieverClient.cpp b/media/libmediaplayerservice/MetadataRetrieverClient.cpp
index fb228ca..9e289d0 100644
--- a/media/libmediaplayerservice/MetadataRetrieverClient.cpp
+++ b/media/libmediaplayerservice/MetadataRetrieverClient.cpp
@@ -67,7 +67,7 @@
     result.append(" MetadataRetrieverClient\n");
     snprintf(buffer, 255, "  pid(%d)\n", mPid);
     result.append(buffer);
-    write(fd, result.string(), result.size());
+    write(fd, result.c_str(), result.size());
     write(fd, "\n", 1);
     return NO_ERROR;
 }