Cleanup: Remove various DoNothing functions and use base::DoNothing().

sandbox/linux/services/yama_unittests.cc

Index: sandbox/linux/services/yama_unittests.cc
diff --git a/sandbox/linux/services/yama_unittests.cc b/sandbox/linux/services/yama_unittests.cc
index 204cfd6a4448c0d9955c924f08a1a6d3914f2193..398eafecf2ad2ffba82e84ea9707b92b1952423c 100644
--- a/sandbox/linux/services/yama_unittests.cc
+++ b/sandbox/linux/services/yama_unittests.cc
@@ -10,6 +10,7 @@
 #include <unistd.h>
 
 #include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/strings/string_util.h"
@@ -151,14 +152,12 @@ TEST(Yama, RestrictPtraceWorks) {
   }
 }
 
-void DoNothing() {}
-
 SANDBOX_TEST(Yama, RestrictPtraceIsDefault) {
   if (!Yama::IsPresent() || HasLinux32Bug())
     return;
 
   CHECK(Yama::DisableYamaRestrictions());
-  ScopedProcess process1(base::Bind(&DoNothing));
+  ScopedProcess process1(base::Bind(&base::DoNothing));
 
   if (Yama::IsEnforcing()) {
     // Check that process1 is protected by Yama, even though it has