Componentise/upstream some password manager resources

This CL changes the following (downstream part is CL 326497013):

(1)
It moves IDS_IOS_PASSWORD_MANAGER_SAVE_PASSWORD_PROMPT to //ios string
resources, and splits its Smart Lock branded version in a separate resource.
Furthermore, it stops using IDS_PRODUCT_NAME and instead creates separate
copies with Google Chrome / Chromium hard-coded instead.

(2)
It moves IDR_IOS_INFOBAR_SAVE_PASSWORD to the //ios image resources (adding
the _IOS in the name in the process). This resources has been defined
specially for iOS all the time.

(3)
It moves IDS_PASSWORD_MANAGER_SMART_LOCK to the component strings, because it
is used across all platforms.

BUG=514241

Review URL: https://codereview.chromium.org/1532893002

Cr-Commit-Position: refs/heads/master@{#365902}
10 files changed