Prefer std::string over String8

String8 is obsolete, only use std::string in the
input libraries now.

Bug: 64258224
Test: make
Change-Id: I958b6b281d969138f39cc26825c877a24bc4a853
diff --git a/services/inputflinger/tests/InputDispatcher_test.cpp b/services/inputflinger/tests/InputDispatcher_test.cpp
index 7ae36d8..aa6df24 100644
--- a/services/inputflinger/tests/InputDispatcher_test.cpp
+++ b/services/inputflinger/tests/InputDispatcher_test.cpp
@@ -54,7 +54,7 @@
 
     virtual nsecs_t notifyANR(const sp<InputApplicationHandle>&,
             const sp<InputWindowHandle>&,
-            const String8&) {
+            const std::string&) {
         return 0;
     }