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There was still two NOTIFY_OBSERVERS macros and in jumbo builds
they triggered an error about macros being redeclared. This
patch renames the macro that implements observer handling
methods for Windows from NOTIFY_OBSERVERS to NOTIFY_OBSERVERS_METHOD.

Bug: 773275
Change-Id: Ie58fd1793b144b694a0a34bfa552569db3f8a200
Reviewed-on: https://chromium-review.googlesource.com/836611Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#525333}