Move StartsWith[ASCII] to base namespace.

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 9264a3305635efa568fd3ff3e98d8b424dadaf4e..36e4c46f5e4514a2a488bdd5c4e2e2d9a5932c51 100644
--- a/chromeos/disks/disk_mount_manager.cc
+++ b/chromeos/disks/disk_mount_manager.cc
@@ -273,8 +273,8 @@ class DiskMountManagerImpl : public DiskMountManager {
     for (MountPointMap::iterator it = mount_points_.begin();
          it != mount_points_.end();
          ++it) {
-      if (StartsWithASCII(it->second.source_path, mount_path,
-                          true /*case sensitive*/)) {
+      if (base::StartsWithASCII(it->second.source_path, mount_path,
+                                true /*case sensitive*/)) {
         // TODO(tbarzic): Handle the case where this fails.
         UnmountPath(it->second.mount_path,
                     UNMOUNT_OPTIONS_NONE,
@@ -603,7 +603,7 @@ class DiskMountManagerImpl : public DiskMountManager {
          it != system_path_prefixes_.end();
          ++it) {
       const std::string& prefix = *it;
-      if (StartsWithASCII(system_path, prefix, true))
+      if (base::StartsWithASCII(system_path, prefix, true))
         return prefix;
     }
     return base::EmptyString();