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Change the existing Open URLs in Chrome Siri shortcut so that instead of
only one URL, it can now accept multiple URLs. Also refactored the code
for creating the std::vector of URLs to avoid duplication of code with
Open URLs In Chrome Incognito.

Bug: 1114012
Change-Id: I22896c3cf1b05c78d5838793c01d2e1bb0b1e211
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2342207
Commit-Queue: Andy Lu <andyhylu@google.com>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796929}