Remove legacy StartsWithASCII function.

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 398eafecf2ad2ffba82e84ea9707b92b1952423c..0e8355d08e6c3fdf1820b2c594761a8f6c3f6f57 100644
--- a/sandbox/linux/services/yama_unittests.cc
+++ b/sandbox/linux/services/yama_unittests.cc
@@ -31,8 +31,9 @@ bool HasLinux32Bug() {
   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__)