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/base/file_magic.cc b/runtime/base/file_magic.cc
index de6f423..568a7ae 100644
--- a/runtime/base/file_magic.cc
+++ b/runtime/base/file_magic.cc
@@ -20,13 +20,16 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 
+#include "android-base/stringprintf.h"
+
 #include "base/logging.h"
 #include "base/unix_file/fd_file.h"
 #include "dex_file.h"
-#include "stringprintf.h"
 
 namespace art {
 
+using android::base::StringPrintf;
+
 File OpenAndReadMagic(const char* filename, uint32_t* magic, std::string* error_msg) {
   CHECK(magic != nullptr);
   File fd(filename, O_RDONLY, /* check_usage */ false);