Remove --enable-audible-notifications flag for feature launch.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 858a0d7a6fd1f95ceaa82ce372b8f33dd020306b..df3b3db012f7ffef8702f759e69c26e92c761668 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -344,12 +344,6 @@ const char kEnableAcceleratedScrollableFrames[] =
 // Turns on extremely verbose logging of accessibility events.
 const char kEnableAccessibilityLogging[]    = "enable-accessibility-logging";
 
-// Enable notifications of audible/silent audio output from a render view.
-//
-// TODO(miu): Remove --enable-audible-notifications once the feature goes
-// live.  http://crbug.com/178934
-const char kEnableAudibleNotifications[]    = "enable-audible-notifications";
-
 // Use a begin frame signal from browser to renderer to schedule rendering.
 const char kEnableBeginFrameScheduling[]    = "enable-begin-frame-scheduling";