[ios] Added web_state js files to Xcode index.
[ios] Added web_state js files to Xcode index.

BUG=549070

Review URL: https://codereview.chromium.org/1763833003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#383241}

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