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 da104907380d1c2633e513799570af261fedd608..aa591b62066261675c396cbf8403b0e21aa43205 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;