Remove FileUtilProxy:DeleteFile().

base/files/file_util_proxy.h

Index: base/files/file_util_proxy.h
diff --git a/base/files/file_util_proxy.h b/base/files/file_util_proxy.h
index db69737648b14f5f2790f46fe994c089d284a313..2e8a1ea0064dfe6c7da9aab4b91214a2eb48e612 100644
--- a/base/files/file_util_proxy.h
+++ b/base/files/file_util_proxy.h
@@ -35,14 +35,6 @@ class BASE_EXPORT FileUtilProxy {
       const FilePath& file_path,
       const GetFileInfoCallback& callback);
 
-  // Deletes a file or a directory.
-  // It is an error to delete a non-empty directory with recursive=false.
-  // This returns false if task posting to |task_runner| has failed.
-  static bool DeleteFile(TaskRunner* task_runner,
-                         const FilePath& file_path,
-                         bool recursive,
-                         const StatusCallback& callback);
-
   // Touches a file. The callback can be null.
   // This returns false if task posting to |task_runner| has failed.
   static bool Touch(