Rename Node/Edge in Android dependency visualization

To avoid confusion with the browser's window.Node, the Node class has
been renamed to GraphNode. For consistency, the Edge class has also been
renamed to GraphEdge.

Bug: 1093962
Change-Id: If412b903a5b86f56623b2424d5f3a260446e68ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2292874
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: James Long <yjlong@google.com>
Cr-Original-Commit-Position: refs/heads/master@{#787333}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7abbcf76ab5688568526ee9f0e001a155aea8e42
5 files changed