Remove legacy StartsWithASCII function.

chromeos/disks/disk_mount_manager.cc

Index: chromeos/disks/disk_mount_manager.cc
diff --git a/chromeos/disks/disk_mount_manager.cc b/chromeos/disks/disk_mount_manager.cc
index a046b215023876649ba70f2ae39a2425314a9539..ed2c5979521b3894fef5751d5f413660f3d1c57b 100644
--- a/chromeos/disks/disk_mount_manager.cc
+++ b/chromeos/disks/disk_mount_manager.cc
@@ -276,8 +276,8 @@ class DiskMountManagerImpl : public DiskMountManager {
     for (MountPointMap::iterator it = mount_points_.begin();
          it != mount_points_.end();
          ++it) {
-      if (base::StartsWithASCII(it->second.source_path, mount_path,
-                                true /*case sensitive*/)) {
+      if (base::StartsWith(it->second.source_path, mount_path,
+                           base::CompareCase::SENSITIVE)) {
         // TODO(tbarzic): Handle the case where this fails.
         UnmountPath(it->second.mount_path,
                     UNMOUNT_OPTIONS_NONE,
@@ -606,7 +606,7 @@ class DiskMountManagerImpl : public DiskMountManager {
          it != system_path_prefixes_.end();
          ++it) {
       const std::string& prefix = *it;
-      if (base::StartsWithASCII(system_path, prefix, true))
+      if (base::StartsWith(system_path, prefix, base::CompareCase::SENSITIVE))
         return prefix;
     }
     return base::EmptyString();