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Code cleanup in cookies_tree_model.cc

Use default constructors and range based for loops.

Change-Id: I7f79f3da4329528c33de871edd6e9d64f3fb0cc8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283312
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Martin Šrámek <msramek@chromium.org>
Auto-Submit: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785682}