[ObjC ARC] Converts ios/chrome/browser/ui/history:history to ARC.
Semi-autogenerated ARCMigrate commit. Notable issues: * Since one of the weak_nsobjects is exposed in a header and I change it to a __weak instead, converted two unit tests to ARC alongside this. * Fixed some assignments of newly created views to weak properties by introducing an intermediate local variable to retain the view until it's added as subview. BUG=624363 TEST=None Review-Url: https://codereview.chromium.org/2624963003 Cr-Commit-Position: refs/heads/master@{#443240}
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