64ccf236e6
Updated all clients that wrap HasObserver and expose it to also take a const pointer. This change avoids further propagation of non-constness (which was previously required when using HasObserver methods). BUG=429588 TBR=michaeln@chromium.org,nyquist@chromium.org,pkotwicz@chromium.org,satorux@chromium.org,sky@chromium.org,zea@chromium.org Review URL: https://codereview.chromium.org/697953002 Cr-Commit-Position: refs/heads/master@{#303428}