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Since we are sending app capabilities to the server, the VerifyProvider
clientOp is no longer needed. This is the second step of removing the
logic:

1. Remove VerifyProvider in the list of supported actions (internal)
2. Remove Handling of the VerifyProvider action (external)
3. Remove the logic of notifying the VerifyProvider action (internal)

Bug: b/134085742
Change-Id: I5c6eab87d24655198696a1b711efeb4ecf15a9dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637650Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Yue Li <updowndota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665237}