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These protocols are moved into components/password_manager/ios to be
shared with other objc embedders of PasswordManagerDriver and
PasswordManagerClient.

Also renamed them to XXXBridge to make it clear the these @protocols are
simply used to bridge C++ methods into ObjC methods.

Change-Id: I13c11d7abf49482fe1355e6b48d54ec9a90d9483
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252856
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784267}