Add scheme whitelist for content intents

Add a whitelist for content intents sent when the user taps
on an address, email address, or phone number.

BUG=659477
TBR=aelias@chromium.org

Review URL: https://codereview.chromium.org/2455753002 .

Review-Url: https://codereview.chromium.org/2448363003
Cr-Original-Commit-Position: refs/heads/master@{#427758}
Cr-Commit-Position: refs/branch-heads/2840@{#778}
Cr-Branched-From: 1ae106dbab4bddd85132d5b75c670794311f4c57-refs/heads/master@{#414607}
1 file changed