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Currently, when the user has chosen about:blank as their homepage, and
Chromium starts up, the location bar is focused, but the URL
"about:blank" is NOT selected.

This leads to the cursor being at index 0, and the user starts typing
BEFORE the existing "about:blank" URL, so typing "foo" leads to:
"fooabout:blank".

This is surprising behavior, and this CL fixes that, as well as adds a
test.

We originally tried to fix this in 2019, but this effort had to be
reverted because we caused a bug on the NTP:
https://chromium-review.googlesource.com/c/chromium/src/+/1559115

This CL preserves the fixed NTP behavior (validated by a test), and
also fixes the about:blank behavior, also validated by a new test.

Bug: 45260
Change-Id: I8ca57ea10215c297aabc22e51138af7ea21ef677
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464202Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816272}