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Rename old target //ios/chrome/app/resources to the more correct name
//ios/chrome/app/resources:ios_resources.

Add a new group target //ios/chrome/app/resources to allow multiple
target to get all resources required in the application bundle and
to act as "chrome" target (i.e. EarlGrey tests).

BUG=672516

Review-Url: https://codereview.chromium.org/2563023002
Cr-Commit-Position: refs/heads/master@{#437846}