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/subprocess_unittest.cc b/common/subprocess_unittest.cc
index 0cb7b37..2328693 100644
--- a/common/subprocess_unittest.cc
+++ b/common/subprocess_unittest.cc
@@ -32,7 +32,7 @@
 #include <base/message_loop/message_loop.h>
 #endif  // BASE_VER < 780000
 #include <base/strings/string_util.h>
-#include <base/strings/stringprintf.h>
+#include <android-base/stringprintf.h>
 #if BASE_VER >= 780000  // Chrome OS
 #include <base/task/single_thread_task_executor.h>
 #endif  // BASE_VER >= 780000
@@ -247,7 +247,7 @@
   vector<string> cmd = {
       kBinPath "/sh",
       "-c",
-      base::StringPrintf(
+      android::base::StringPrintf(
           // The 'sleep' launched below could be left behind as an orphaned
           // process when the 'sh' process is terminated by SIGTERM. As a
           // remedy, trap SIGTERM and kill the 'sleep' process, which requires