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BUG=pdfium:611
Review-Url: https://codereview.chromium.org/2382723003
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This may be a better design because it avoids having a level
of indirection that the Observer required.
Review-Url: https://codereview.chromium.org/2326763002
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Previously, the observer set a flag which conditionalized a null
pointer return. Now, we just clear the pointer.
Destruction order matters, so add a method to trigger notifications.
Review-Url: https://codereview.chromium.org/2322743002
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Review-Url: https://codereview.chromium.org/2311343003
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