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Rename IntentHandlerInfo's ActionType field from "action" to
"action_type" and add a new string "action" field. Update
Chrome to use the enum field's new name.

In the IntentHelperInstance interface, also rename
HandleUrlList and HandleUrlListDeprecated's ActionType
parameters from "action" to "action_type". The method
signatures remain unchanged.

BUG=647802

Review-Url: https://codereview.chromium.org/2396633002
Cr-Commit-Position: refs/heads/master@{#422994}