DevTools: Remove stripes from heap snapshot view
DevTools: Remove stripes from heap snapshot view

This speeds up the view and makes design more neat.

R=pfeldman@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/149173008

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@166130 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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