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The package graph page is now blue, and the class graph page is now red.
The favicons for each page type have been updated to reflect this, and
links to the other page type have the corresponding icons in order to
indicate a change in the page type.

Hyperlinks remain blue, regardless of page type, to avoid confusion.

Bug: 1102546
Change-Id: I23ef7fb7cb2a85678a4b29712716905523a89cab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354526
Commit-Queue: James Long <yjlong@google.com>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798140}