Reapply 61613 that was reverted for false valgrind alarm.

webkit/tools/test_shell/simple_file_system.cc

Index: webkit/tools/test_shell/simple_file_system.cc
diff --git a/webkit/tools/test_shell/simple_file_system.cc b/webkit/tools/test_shell/simple_file_system.cc
index 8e059ead4c608469716abbaae01692a9c81bdcf7..411d987d730f1959b5ec90ecee3fa71f0dfcbfcc 100644
--- a/webkit/tools/test_shell/simple_file_system.cc
+++ b/webkit/tools/test_shell/simple_file_system.cc
@@ -133,7 +133,14 @@ void SimpleFileSystem::remove(
     const WebString& path, WebFileSystemCallbacks* callbacks) {
   FilePath filepath(webkit_glue::WebStringToFilePath(path));
 
-  GetNewOperation(callbacks)->Remove(filepath);
+  GetNewOperation(callbacks)->Remove(filepath, false /* recursive */);
+}
+
+void SimpleFileSystem::removeRecursively(
+    const WebString& path, WebFileSystemCallbacks* callbacks) {
+  FilePath filepath(webkit_glue::WebStringToFilePath(path));
+
+  GetNewOperation(callbacks)->Remove(filepath, true /* recursive */);
 }
 
 void SimpleFileSystem::readMetadata(