Replace chrome string util with android base ones

Replaces <base/stringutils.h> with <android-base/stringutils.h>
Replaces base::StringPrintf with android::base::StringPrintf

This change is very mechanical, no change in program behavior only
library functions are being replaced.

Test: th
Change-Id: Ie5797a27ea3cdd3ff537216dc39dffeac052565e
diff --git a/common/file_fetcher.cc b/common/file_fetcher.cc
index 7134fd6..dd994ab 100644
--- a/common/file_fetcher.cc
+++ b/common/file_fetcher.cc
@@ -24,7 +24,7 @@
 #include <base/location.h>
 #include <base/logging.h>
 #include <base/strings/string_util.h>
-#include <base/strings/stringprintf.h>
+#include <android-base/stringprintf.h>
 #include <brillo/streams/file_stream.h>
 
 #include "update_engine/common/hardware_interface.h"