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And validate them accordingly (all-space names are still empty and invalid).

BUG=405913
TEST=Go to chrome://settings. Try to enter "      " for the profile name. The
textbox should stay red. Enter "     batman    " for the profile name, and save.
The name should be saved as just "batman". Expect some bat signals.

Review URL: https://codereview.chromium.org/532023003

Cr-Commit-Position: refs/heads/master@{#293571}