[fsp] Fix incorrect handling of file system URLs when containing a %.

webkit/common/fileapi/file_system_util.cc

Index: webkit/common/fileapi/file_system_util.cc
diff --git a/webkit/common/fileapi/file_system_util.cc b/webkit/common/fileapi/file_system_util.cc
index a19136a1e9e20acf7add98ae88eb4f896a112350..ded3457ccf3efb2626c51f6491701a7adefefca5 100644
--- a/webkit/common/fileapi/file_system_util.cc
+++ b/webkit/common/fileapi/file_system_util.cc
@@ -454,12 +454,12 @@ std::string GetIsolatedFileSystemRootURIString(
                                           kFileSystemTypeIsolated).spec();
   if (base::FilePath::FromUTF8Unsafe(filesystem_id).ReferencesParent())
     return std::string();
-  root.append(filesystem_id);
+  root.append(net::EscapePath(filesystem_id));
   root.append("/");
   if (!optional_root_name.empty()) {
     if (base::FilePath::FromUTF8Unsafe(optional_root_name).ReferencesParent())
       return std::string();
-    root.append(optional_root_name);
+    root.append(net::EscapePath(optional_root_name));
     root.append("/");
   }
   return root;
@@ -472,7 +472,7 @@ std::string GetExternalFileSystemRootURIString(
                                           kFileSystemTypeExternal).spec();
   if (base::FilePath::FromUTF8Unsafe(mount_name).ReferencesParent())
     return std::string();
-  root.append(mount_name);
+  root.append(net::EscapePath(mount_name));
   root.append("/");
   return root;
 }