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Also clean up the native side a bit (it doesn't need a weak reference
if it is destroyed from the Java side).

Better diff of the renamed file at
https://gist.github.com/sheepmaster/347a1a7d16dd3b23629888bf467faac5
(via `git fetch https://chromium.googlesource.com/chromium/src refs/changes/58/1006758/3 && git diff FETCH_HEAD^:chrome/android/java/src/org/chromium/chrome/browser/toolbar/ToolbarModelImpl.java FETCH_HEAD:chrome/android/java/src/org/chromium/chrome/browser/toolbar/ToolbarModel.java`)

Change-Id: I8a5fde53c0eed48547faca5486a967d836998fb7
Reviewed-on: https://chromium-review.googlesource.com/1006758Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549919}