Clean up unittests mocking IsOffTheRecord on PasswordManagerDriver

Originally, IsOffTheRecord used to be a method of PasswordManagerDriver,
but was moved to PasswordManagerClient.
Clear up the mocks of "EXPECT_CALL(*(client()->mock_driver()),
IsOffTheRecord()).WillRepeatedly(Return(false));"

BUG=440426

Review URL: https://codereview.chromium.org/904643002

Cr-Commit-Position: refs/heads/master@{#315507}
2 files changed