Fix trailing whitespace in .cpp, .h, and .idl files (ex. Source/core)

Source/modules/webaudio/PannerNode.idl

Index: Source/modules/webaudio/PannerNode.idl
diff --git a/Source/modules/webaudio/PannerNode.idl b/Source/modules/webaudio/PannerNode.idl
index d20a2e65194d36a226ac190920037913b3ddaa9b..899b8a975f5a43188ba47b5c7a4a6e86d48b4f08 100644
--- a/Source/modules/webaudio/PannerNode.idl
+++ b/Source/modules/webaudio/PannerNode.idl
@@ -36,10 +36,10 @@
     const unsigned short INVERSE_DISTANCE = 1;
     const unsigned short EXPONENTIAL_DISTANCE = 2;
 
-    // Default model for stereo is HRTF 
+    // Default model for stereo is HRTF
     [CustomSetter] attribute DOMString panningModel;
 
-    // Uses a 3D cartesian coordinate system 
+    // Uses a 3D cartesian coordinate system
     void setPosition(float x, float y, float z);
     void setOrientation(float x, float y, float z);
     void setVelocity(float x, float y, float z);