The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/936b4be1f4e1b151e3f9e37a3d0859a32dabb6e1

commit 936b4be1f4e1b151e3f9e37a3d0859a32dabb6e1
Author: Raymond Toy <rtoy@chromium.org>
Date: Tue Aug 15 23:01:48 2017

Remove BaseAudioContext constructor for offline contexts

There was a special BaseAudioContext constructor just for offline
contexts.  Remove this and have just one BaseAudioContext constructor
taking an argument indicating whether this is an offline or online
context.

Remove the virtual HasRealtimeConstraint function too by making it
non-virtual and returning the value of the flag used in construction.

No changes in behavior; this is all internal.

Bug:  752643 
Test: none
Change-Id: I2334d35cc5adcc5434844dc1d59e8d5ecb5c9720
Reviewed-on: https://chromium-review.googlesource.com/602773
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Commit-Queue: Raymond Toy <rtoy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#494590}
[modify] https://crrev.com/936b4be1f4e1b151e3f9e37a3d0859a32dabb6e1/third_party/WebKit/Source/modules/webaudio/AudioContext.cpp
[modify] https://crrev.com/936b4be1f4e1b151e3f9e37a3d0859a32dabb6e1/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp
[modify] https://crrev.com/936b4be1f4e1b151e3f9e37a3d0859a32dabb6e1/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
[modify] https://crrev.com/936b4be1f4e1b151e3f9e37a3d0859a32dabb6e1/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp