Make FileSystemURL::ToGURL consistent with DOMFileSystemBase.

content/browser/fileapi/file_system_url_unittest.cc

Index: content/browser/fileapi/file_system_url_unittest.cc
diff --git a/content/browser/fileapi/file_system_url_unittest.cc b/content/browser/fileapi/file_system_url_unittest.cc
index 2e1fb14c7b9f45ad4a1b2ef6dfd86683235fb417..4aa23dd8ab4634791d2fe737bb1e602dcbed2906 100644
--- a/content/browser/fileapi/file_system_url_unittest.cc
+++ b/content/browser/fileapi/file_system_url_unittest.cc
@@ -173,6 +173,7 @@ TEST(FileSystemURLTest, ToGURL) {
     "filesystem:http://chromium.org/isolated/directory/file2",
     "filesystem:http://chromium.org/external/directory/file2",
     "filesystem:http://chromium.org/test/directory/file3",
+    "filesystem:http://chromium.org/test/plus%2B/space%20/colon%3A",
   };
 
   for (size_t i = 0; i < arraysize(kTestURL); ++i) {