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  StoragePartitionHttpCacheDataRemover.

This will enable us to to clear http cache from a StoragePartition from
  chrome/ layer. <webview>s with their own storage partitions can use
  this to clear patitions' cache.

This will be used to implement clear cache for <webview>, complete
  CL is: https://chromiumcodereview.appspot.com/1021073002/

BUG=406437
Test=None, internal only change.

Review URL: https://codereview.chromium.org/1033013003

Cr-Commit-Position: refs/heads/master@{#322428}