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In the previous change (http://crrev.com/2915763005) I added version of
MergeSyncData that takes EntityChangeList instead of EntityDataMap. This is
needed to support bridges that can't generate storage key based on EntityData.

In this change I switch already implemented bridges to the new MergeSyncData
signature.

MergeSyncData takes EntityChangeList where each change has type ACTION_ADD, and
prepopulated storage_key.

R=skym@chromium.org
TBR=olivierrobin@chromium.org
BUG=719570

Review-Url: https://codereview.chromium.org/2923363004
Cr-Commit-Position: refs/heads/master@{#478844}