capture_context_mac (32-bit x86): Comments and code should agree more
capture_context_mac (32-bit x86): Comments and code should agree more

It looks like I wrote the x86_64 version first and didn’t adapt
everything perfectly when transitioning to 32-bit x86. This shouldn’t
affect anything functionally.

R=rsesek@chromium.org

Review URL: https://codereview.chromium.org/1332913002 .

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