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

Source/bindings/v8/custom/V8PannerNodeCustom.cpp

Index: Source/bindings/v8/custom/V8PannerNodeCustom.cpp
diff --git a/Source/bindings/v8/custom/V8PannerNodeCustom.cpp b/Source/bindings/v8/custom/V8PannerNodeCustom.cpp
index 00b9c6281a13b2cd45bdeead237cb8d5cbcafbda..66f89a9aca9ce971b2326cd47331795f72fc063a 100644
--- a/Source/bindings/v8/custom/V8PannerNodeCustom.cpp
+++ b/Source/bindings/v8/custom/V8PannerNodeCustom.cpp
@@ -53,7 +53,7 @@ void V8PannerNode::panningModelAttrSetterCustom(v8::Local<v8::String> name, v8::
             return;
         }
     }
-    
+
     throwTypeError("Illegal panningModel", info.GetIsolate());
 }
 
@@ -77,7 +77,7 @@ void V8PannerNode::distanceModelAttrSetterCustom(v8::Local<v8::String> name, v8:
             return;
         }
     }
-    
+
     throwTypeError("Illegal distanceModel", info.GetIsolate());
 }