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This CL fixes some colors in MD History that were low contrast. It also
makes a bunch of colors consistent and pulls most colors into
shared_vars.html so we can better manage our vast color spectrum.

BUG=670836
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2549133003
Cr-Commit-Position: refs/heads/master@{#438073}