Remove legacy StartsWithASCII function.

sandbox/linux/services/yama_unittests.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/ptrace.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ skipping 13 matching lines @@
 
 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 = base::StartsWithASCII(
-      base::SysInfo::OperatingSystemVersion(), "3.2", /*case_sensitive=*/false);
+  bool is_3_dot_2 = base::StartsWith(
+      base::SysInfo::OperatingSystemVersion(), "3.2",
+      base::CompareCase::INSENSITIVE_ASCII);
   if (is_kernel_64bit && is_linux && is_3_dot_2)
     return true;
 #endif  // defined(__i386__)
   return false;
 }
 
 bool CanPtrace(pid_t pid) {
   int ret;
   ret = ptrace(PTRACE_ATTACH, pid, NULL, NULL);
   if (ret == -1) {
@@ skipping 116 matching lines @@
   if (Yama::IsEnforcing()) {
     // Check that process1 is protected by Yama, even though it has
     // been created from a process that disabled Yama.
     CHECK(!CanSubProcessPtrace(process1.GetPid()));
   }
 }
 
 }  // namespace
 
 }  // namespace sandbox