ART: Move to libbase StringPrintf

Remove ART's StringPrintf implementation. Fix up clients. Add
missing includes where necessary.

Test: m test-art-host
Change-Id: I564038d5868595ac3bb88d641af1000cea940e5a
diff --git a/runtime/ti/agent.cc b/runtime/ti/agent.cc
index d21ff77..0bba44c 100644
--- a/runtime/ti/agent.cc
+++ b/runtime/ti/agent.cc
@@ -15,12 +15,17 @@
  */
 
 #include "agent.h"
+
+#include "android-base/stringprintf.h"
+
 #include "java_vm_ext.h"
 #include "runtime.h"
 
 namespace art {
 namespace ti {
 
+using android::base::StringPrintf;
+
 const char* AGENT_ON_LOAD_FUNCTION_NAME = "Agent_OnLoad";
 const char* AGENT_ON_ATTACH_FUNCTION_NAME = "Agent_OnAttach";
 const char* AGENT_ON_UNLOAD_FUNCTION_NAME = "Agent_OnUnload";