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Before this CL, some tests in ModuleScriptLoaderTest have wrong test
expectations and test helpers have wrong implementation as follows:

1) Dummy Modulator doesn't have a valid SecurityOrigin, so the CORS handling
   fails.
2) Mocked ResourceResponse doesn't have a Content-Type header, so a generated
   ScriptResource doesn't have a valid MIME type (ScriptResource respects the
   header instead of ResourceResponse::MimeType()).

This CL fixes them and corrects the test expectations.

In addition, this CL...

3) replaces NullURL() on the KURL constructor calls with kParsedURLString
   because they generate KURL instances from URL strings.
4) makes TouchActionTests specify the MIME types. Without this change, these
   tests set the Content-Type header to the default MIME type "text/html" and
   start to fail.

Bug: n/a
Change-Id: Ifffa734dcb4e44a670172f27c30efcdcc075e5be
Reviewed-on: https://chromium-review.googlesource.com/627523
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496608}