Fix incorrect memory dump indexes update
Fix incorrect memory dump indexes update

I miss understood the new memory dump format and the indexes are not
updated correctly. It seems they are by process and not global.

R=fmeawad@chromium.org
CC=erikchen@chromium.org, dskiba@chromium.org
BUG=chromium:733056

Review-Url: https://codereview.chromium.org/2969533002

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