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This CL moves SigninView to signin.ui target.

Bug: 1157052
Change-Id: I2211e6f6592dccbe4d73edeb8b6e18f173a92c13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2582324
Commit-Queue: Alice Wang <aliceywang@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836053}