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This change fixes multiple issues with the process-internals page when
viewed in high contrast. Specifically, the header background and tree
highlight colors are fixed. See the bug for screenshots.

Bug: 1023585
Change-Id: I6405e8b02c5020eb64d3aff93c564ab20a613ef0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911482Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Cliff Smolinsky <cliffsmo@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#714514}