Mark all virtual overrides in the hierarchy of Module as virtual and OVERRIDE.

This will make a subsequent change I intend to do safer, where I'll change the
return type of one of the base Module functions, by breaking the compile if I
miss any overrides.

This also highlighted a number of unused functions (in many cases apparently
virtual "overrides" of no-longer-existent base functions).  I've removed some of
these.

This also highlighted several cases where "virtual" was used unnecessarily to
mark a function that was only defined in one class.  Removed "virtual" in those
cases.

BUG=none
TEST=none
R=andrew@webrtc.org, henrik.lundin@webrtc.org, mallinath@webrtc.org, mflodman@webrtc.org, stefan@webrtc.org, turaj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/24419004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7146 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_processing/main/interface/video_processing.h

@@ -89,12 +89,12 @@ class VideoProcessingModule : public Module {
   /**
      Not supported.
   */
-  virtual int32_t TimeUntilNextProcess() { return -1; }
+  virtual int32_t TimeUntilNextProcess() OVERRIDE { return -1; }
 
   /**
      Not supported.
   */
-  virtual int32_t Process() { return -1; }
+  virtual int32_t Process() OVERRIDE { return -1; }
 
   /**
      Resets all processing components to their initial states. This should be