Fix dependency: make file_system_util not depend on FileSystemURL

webkit/fileapi/file_system_url.cc

Index: webkit/fileapi/file_system_url.cc
diff --git a/webkit/fileapi/file_system_url.cc b/webkit/fileapi/file_system_url.cc
index 8071aaf08bb862c931992f0e41cbae0a2faa253f..3427ec8f309e769944c99a362814b37e155b9675 100644
--- a/webkit/fileapi/file_system_url.cc
+++ b/webkit/fileapi/file_system_url.cc
@@ -155,12 +155,16 @@ std::string FileSystemURL::DebugString() const {
 }
 
 bool FileSystemURL::IsParent(const FileSystemURL& child) const {
-  return origin() == child.origin() &&
-         type() == child.type() &&
-         filesystem_id() == child.filesystem_id() &&
+  return IsInSameFileSystem(child) &&
          path().IsParent(child.path());
 }
 
+bool FileSystemURL::IsInSameFileSystem(const FileSystemURL& other) const {
+  return origin() == other.origin() &&
+         type() == other.type() &&
+         filesystem_id() == other.filesystem_id();
+}
+
 bool FileSystemURL::operator==(const FileSystemURL& that) const {
   return origin_ == that.origin_ &&
       type_ == that.type_ &&