Validate finiteness of HTMLMediaElement properties.

Source/core/html/HTMLMediaElement.h

Index: Source/core/html/HTMLMediaElement.h
diff --git a/Source/core/html/HTMLMediaElement.h b/Source/core/html/HTMLMediaElement.h
index 63f3ab8d68cf58ef98b73aa039900d32aa741496..02698e0cee18d5b288ef310b687b7bda7790b27a 100644
--- a/Source/core/html/HTMLMediaElement.h
+++ b/Source/core/html/HTMLMediaElement.h
@@ -128,9 +128,9 @@ public:
     virtual double duration() const OVERRIDE FINAL;
     bool paused() const;
     double defaultPlaybackRate() const;
-    void setDefaultPlaybackRate(double);
+    void setDefaultPlaybackRate(double, ExceptionState&);
     double playbackRate() const;
-    void setPlaybackRate(double);
+    void setPlaybackRate(double, ExceptionState&);
     void updatePlaybackRate();
     PassRefPtr<TimeRanges> played();
     PassRefPtr<TimeRanges> seekable() const;
@@ -391,8 +391,6 @@ private:
     // Pauses playback without changing any states or generating events
     void setPausedInternal(bool);
 
-    void setPlaybackRateInternal(double);
-
     void setShouldDelayLoadEvent(bool);
     void invalidateCachedTime();
     void refreshCachedTime() const;