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The API key is not actually required to perform the request as long as
you are only dealing with authenticated requests (The access token is
enough of an identifier). This CL removes the API key (which has since
been revoked) as well as fixes a (use before define) bug in auth.js

Change-Id: I5abdde63b65b868d79a3bc4ca47ff59bc65cb25a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2092423Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748226}