Fix infinite recursion with CRWWebController's _requireReloadOnDisplay
Fix infinite recursion with CRWWebController's _requireReloadOnDisplay

When _requireReloadOnDisplay is set, the code to re-issue the load can
itself call -view, so it's critical to clear the flag before running
any of the logic, rather than at the end.

BUG=574188
TEST=Go to a page requiring a form submission, then in other tab use
enough memory that the renderer process for the form tab is killed by
the OS; on switching back, the app should not hang and then crash.

Review URL: https://codereview.chromium.org/1562763003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#367886}

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