Move StartsWith[ASCII] to base namespace.

chrome/browser/chromeos/file_manager/file_tasks.cc

Index: chrome/browser/chromeos/file_manager/file_tasks.cc
diff --git a/chrome/browser/chromeos/file_manager/file_tasks.cc b/chrome/browser/chromeos/file_manager/file_tasks.cc
index d4cb77ebc48ae50fa172100575b316d3e118c6c9..b70c7b7d0c0d5c066db4977af9e81cbe960769c5 100644
--- a/chrome/browser/chromeos/file_manager/file_tasks.cc
+++ b/chrome/browser/chromeos/file_manager/file_tasks.cc
@@ -228,7 +228,7 @@ bool ParseTaskID(const std::string& task_id, TaskDescriptor* task) {
   // identified by a prefix "drive-app:" on the extension ID. The legacy task
   // IDs can be stored in preferences.
   if (count == 2) {
-    if (StartsWithASCII(result[0], kDriveTaskExtensionPrefix, true)) {
+    if (base::StartsWithASCII(result[0], kDriveTaskExtensionPrefix, true)) {
       task->task_type = TASK_TYPE_DRIVE_APP;
       task->app_id = result[0].substr(kDriveTaskExtensionPrefixLength);
     } else {