--- a/layout/style/nsMediaList.cpp
+++ b/layout/style/nsMediaList.cpp
@@ -161,17 +161,17 @@ nsMediaExpression::Matches(nsPresContext
       break;
     case nsMediaFeature::eIdent:
       {
         NS_ASSERTION(actual.GetUnit() == eCSSUnit_Ident,
                      "bad actual value");
         NS_ASSERTION(required.GetUnit() == eCSSUnit_Ident,
                      "bad required value");
         NS_ASSERTION(mFeature->mRangeType == nsMediaFeature::eMinMaxNotAllowed,
-                     "bad range"); 
+                     "bad range");
         cmp = !(actual == required); // string comparison
       }
       break;
   }
   switch (mRange) {
     case nsMediaExpression::eMin:
       return cmp != -1;
     case nsMediaExpression::eMax:
@@ -606,22 +606,22 @@ nsMediaList::GetMediaText(nsAString& aMe
 NS_IMETHODIMP
 nsMediaList::SetMediaText(const nsAString& aMediaText)
 {
   nsCOMPtr<nsIDocument> doc;
 
   BEGIN_MEDIA_CHANGE(mStyleSheet, doc)
 
   SetText(aMediaText);
-  
+
   END_MEDIA_CHANGE(mStyleSheet, doc)
 
   return NS_OK;
 }
-                               
+
 NS_IMETHODIMP
 nsMediaList::GetLength(uint32_t* aLength)
 {
   NS_ENSURE_ARG_POINTER(aLength);
 
   *aLength = Length();
   return NS_OK;
 }
@@ -649,40 +649,40 @@ nsMediaList::IndexedGetter(uint32_t aInd
 
 NS_IMETHODIMP
 nsMediaList::DeleteMedium(const nsAString& aOldMedium)
 {
   nsresult rv = NS_OK;
   nsCOMPtr<nsIDocument> doc;
 
   BEGIN_MEDIA_CHANGE(mStyleSheet, doc)
-  
+
   rv = Delete(aOldMedium);
   if (NS_FAILED(rv))
     return rv;
 
   END_MEDIA_CHANGE(mStyleSheet, doc)
-  
+
   return rv;
 }
 
 NS_IMETHODIMP
 nsMediaList::AppendMedium(const nsAString& aNewMedium)
 {
   nsresult rv = NS_OK;
   nsCOMPtr<nsIDocument> doc;
 
   BEGIN_MEDIA_CHANGE(mStyleSheet, doc)
-  
+
   rv = Append(aNewMedium);
   if (NS_FAILED(rv))
     return rv;
 
   END_MEDIA_CHANGE(mStyleSheet, doc)
-  
+
   return rv;
 }
 
 nsresult
 nsMediaList::Delete(const nsAString& aOldMedium)
 {
   if (aOldMedium.IsEmpty())
     return NS_ERROR_DOM_NOT_FOUND_ERR;