Fix password export warning string on Android

The mocks [1] changed and dropped "passwords" from the warning string
before exporting passwords from Chrome settings on Android. This CL
updates the code.

[1]
https://docs.google.com/presentation/d/1nIm5OmaOnb85ZAwMZPSVqHT0vkFbsRYZhOzbmznWU_c/edit?ts=5a549b02#slide=id.g289b1efcd8_0_21

Bug: 788701
Change-Id: Id61bf4e17267cd2c4694510c2a13318e21045e3f
Reviewed-on: https://chromium-review.googlesource.com/870593
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#529759}
1 file changed