Use HTTPS links for Google domains in docs

docs/testing/writing_layout_tests.md

 # Writing Layout Tests
 
 _Layout tests_ is a bit of a misnomer. This term is
 [a part of our WebKit heritage](https://webkit.org/blog/1452/layout-tests-theory/),
 and we use it to refer to every test that is written as a Web page (HTML, SVG,
 or XHTML) and lives in
 [third_party/WebKit/LayoutTests/](../../third_party/WebKit/LayoutTests).
 
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 [Google's JavaScript Style Guide](https://google.github.io/styleguide/jsguide.html),
 and
 [Google's HTML/CSS Style Guide](https://google.github.io/styleguide/htmlcssguide.xml),
 with the following exceptions.
 
 * Rules related to Google Closure and JSDoc do not apply.
 * Modern Web Platform and JavaScript features should be preferred to legacy
   constructs that target old browsers.
 * Per the JavaScript guide, new tests should also follow any per-project
   style guide, such as the
-  [ServiceWorker Tests Style guide](http://www.chromium.org/blink/serviceworker/testing).
+  [ServiceWorker Tests Style guide](https://www.chromium.org/blink/serviceworker/testing).
 
 ## JavaScript Tests
 
 Whenever possible, the testing criteria should be expressed in JavaScript. The
 alternatives, which will be described in future sections, result in slower and
 less reliable tests.
 
 All new JavaScript tests should be written using the
 [testharness.js](https://github.com/w3c/testharness.js/) testing framework. This
 framework is used by the tests in the
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 * The `http/` directory hosts tests that require an HTTP server (see above).
 * The `resources/` subdirectory in every directory contains binary files, such
   as media files, and code that is shared by multiple test files.
 
 *** note
 Some layout tests consist of a minimal HTML page that references a JavaScript
 file in `resources/`. Please do not use this pattern for new tests, as it goes
 against the minimality principle. JavaScript and CSS files should only live in
 `resources/` if they are shared by at least two test files.
 ***