Remove app_name.xml.
Remove app_name.xml.

The resource "@string/app_name" is already defined in
chrome/android/java/res_default/values/channel_constants.xml. No need to
define it twice; in fact, aapt doesn't like if we define it twice.

Review URL: https://codereview.chromium.org/1284423002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#343113}

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