Remove incorrect comment.

Bug: 1020132
Change-Id: I911e4b9901e4febeb09a568ae2759d1c63bb7a80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919149
Auto-Submit: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715740}

third_party/blink/public/platform/platform.h

@@ -550,8 +550,6 @@ class BLINK_PLATFORM_EXPORT Platform {
 
   // WebRTC ----------------------------------------------------------
 
-  // Checks if the default minimum starting volume value for the AGC is
-  // overridden on the command line.
   virtual base::Optional<double> GetWebRtcMaxCaptureFrameRate() {
     return base::nullopt;
   }