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This CL breaks down a long if/else if/.../else block into smaller
blocks, using early returns. No functional changes are introduced.

Change-Id: I329599ac5a8bb54408e8c0c657b40d330b76765f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065357
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743200}