Revert of Disable yama on 3.2 kernels with 32bit userland and 64bit kernel.

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 4722af3369c2820f07d97ed560bec3a6ab6f8786..17ef4b40de5a046286296eab9fafb8302e6ac2cb 100644
--- a/sandbox/linux/services/yama_unittests.cc
+++ b/sandbox/linux/services/yama_unittests.cc
@@ -12,8 +12,6 @@
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/posix/eintr_wrapper.h"
-#include "base/strings/string_util.h"
-#include "base/sys_info.h"
 #include "sandbox/linux/services/scoped_process.h"
 #include "sandbox/linux/services/yama.h"
 #include "sandbox/linux/tests/unit_tests.h"
@@ -22,21 +20,6 @@
 namespace sandbox {
 
 namespace {
-
-bool HasLinux32Bug() {
-#if defined(__i386__)
-  // On 3.2 kernels, yama doesn't work for 32-bit binaries on 64-bit kernels.
-  // This is fixed in 3.4.
-  bool is_kernel_64bit =
-      base::SysInfo::OperatingSystemArchitecture() == "x86_64";
-  bool is_linux = base::SysInfo::OperatingSystemName() == "Linux";
-  bool is_3_dot_2 = StartsWithASCII(
-      base::SysInfo::OperatingSystemVersion(), "3.2", /*case_sensitive=*/false);
-  if (is_kernel_64bit && is_linux && is_3_dot_2)
-    return true;
-#endif  // defined(__i386__)
-  return false;
-}
 
 bool CanPtrace(pid_t pid) {
   int ret;