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This patch removes the extra form data added, if "value" attribute
present with non-empty value for <input type='image'>

Intent to Deprecate and Remove:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/hp1_-1tgvDs

Bug: 753746
Change-Id: I6a4987a7fb5751b75ff2472f594063876ec076a1
Reviewed-on: https://chromium-review.googlesource.com/1086953
Commit-Queue: Shanmuga Pandi <shanmuga.m@samsung.com>
Reviewed-by: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#564854}