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Now all reloads triggered by user interfaces are replaced by
ReloadMainResource, but Location.reload() and History.go() still call
the traditional Reload.

This patch changes them to call ReloadMainResource insteads under a
runtime flag. This flag will be wired to a field study flag later.

This is discussed at loading-dev@ in the following thread.
https://groups.google.com/a/chromium.org/d/topic/loading-dev/gD-MPRcfwVA/discussion

BUG=670237

Review-Url: https://codereview.chromium.org/2555963003
Cr-Commit-Position: refs/heads/master@{#438766}