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Use the tab height constant instead of the height of the view. The former should match the desired height anyway, since group headers are TabSlotViews. The latter can sometimes be 0, e.g. when dragging a group header into a new window.

Bug: 1005333
Change-Id: I6000af475cb25f0635fbacc1f0ef8acd6aa9fe67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906329Reviewed-by: Charlene Yan <cyan@chromium.org>
Reviewed-by: Taylor Bergquist <tbergquist@chromium.org>
Commit-Queue: Connie Wan <connily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714526}