diff --git a/mozilla/layout/mathml/base/src/nsMathMLFrame.cpp b/mozilla/layout/mathml/base/src/nsMathMLFrame.cpp
index 01356afb5a3..e92fb609f0d 100644
--- a/mozilla/layout/mathml/base/src/nsMathMLFrame.cpp
+++ b/mozilla/layout/mathml/base/src/nsMathMLFrame.cpp
@@ -417,7 +417,7 @@ nsMathMLFrame::CalcLength(nsPresContext*   aPresContext,
   NS_ASSERTION(aCSSValue.IsLengthUnit(), "not a length unit");
 
   if (aCSSValue.IsFixedLengthUnit()) {
-    return aCSSValue.GetLengthTwips(aPresContext);
+    return aCSSValue.GetLengthTwips();
   }
 
   nsCSSUnit unit = aCSSValue.GetUnit();
diff --git a/mozilla/layout/style/nsCSSValue.cpp b/mozilla/layout/style/nsCSSValue.cpp
index 6bc229ad674..c5cd5a5dba2 100644
--- a/mozilla/layout/style/nsCSSValue.cpp
+++ b/mozilla/layout/style/nsCSSValue.cpp
@@ -41,7 +41,6 @@
 #include "imgIRequest.h"
 #include "nsIDocument.h"
 #include "nsContentUtils.h"
-#include "nsPresContext.h"
 
 // Paint forcing
 #include "prenv.h"
@@ -208,39 +207,36 @@ imgIRequest* nsCSSValue::GetImageValue() const
   return mValue.mImage->mRequest;
 }
 
-nscoord nsCSSValue::GetLengthTwips(nsPresContext* aPresContext) const
+nscoord nsCSSValue::GetLengthTwips() const
 {
   NS_ASSERTION(IsFixedLengthUnit(), "not a fixed length unit");
-  NS_ASSERTION(aPresContext, "aPresContext is null");
 
-  float scale =
-    aPresContext->ScaledPixelsToTwips() / aPresContext->PixelsToTwips();
   if (IsFixedLengthUnit()) {
     switch (mUnit) {
     case eCSSUnit_Inch:        
-      return NS_INCHES_TO_TWIPS(mValue.mFloat * scale);
+      return NS_INCHES_TO_TWIPS(mValue.mFloat);
     case eCSSUnit_Foot:        
-      return NS_FEET_TO_TWIPS(mValue.mFloat * scale);
+      return NS_FEET_TO_TWIPS(mValue.mFloat);
     case eCSSUnit_Mile:        
-      return NS_MILES_TO_TWIPS(mValue.mFloat * scale);
+      return NS_MILES_TO_TWIPS(mValue.mFloat);
 
     case eCSSUnit_Millimeter:
-      return NS_MILLIMETERS_TO_TWIPS(mValue.mFloat * scale);
+      return NS_MILLIMETERS_TO_TWIPS(mValue.mFloat);
     case eCSSUnit_Centimeter:
-      return NS_CENTIMETERS_TO_TWIPS(mValue.mFloat * scale);
+      return NS_CENTIMETERS_TO_TWIPS(mValue.mFloat);
     case eCSSUnit_Meter:
-      return NS_METERS_TO_TWIPS(mValue.mFloat * scale);
+      return NS_METERS_TO_TWIPS(mValue.mFloat);
     case eCSSUnit_Kilometer:
-      return NS_KILOMETERS_TO_TWIPS(mValue.mFloat * scale);
+      return NS_KILOMETERS_TO_TWIPS(mValue.mFloat);
 
     case eCSSUnit_Point:
-      return NSFloatPointsToTwips(mValue.mFloat * scale);
+      return NSFloatPointsToTwips(mValue.mFloat);
     case eCSSUnit_Pica:
-      return NS_PICAS_TO_TWIPS(mValue.mFloat * scale);
+      return NS_PICAS_TO_TWIPS(mValue.mFloat);
     case eCSSUnit_Didot:
-      return NS_DIDOTS_TO_TWIPS(mValue.mFloat * scale);
+      return NS_DIDOTS_TO_TWIPS(mValue.mFloat);
     case eCSSUnit_Cicero:
-      return NS_CICEROS_TO_TWIPS(mValue.mFloat * scale);
+      return NS_CICEROS_TO_TWIPS(mValue.mFloat);
     default:
       NS_ERROR("should never get here");
       break;
diff --git a/mozilla/layout/style/nsCSSValue.h b/mozilla/layout/style/nsCSSValue.h
index 5b5c62ae790..930991d9357 100644
--- a/mozilla/layout/style/nsCSSValue.h
+++ b/mozilla/layout/style/nsCSSValue.h
@@ -49,7 +49,6 @@
 
 class imgIRequest;
 class nsIDocument;
-class nsPresContext;
 
 enum nsCSSUnit {
   eCSSUnit_Null         = 0,      // (n/a) null unit, value is not specified
@@ -244,7 +243,7 @@ public:
   // all over.
   NS_HIDDEN_(imgIRequest*) GetImageValue() const;
 
-  NS_HIDDEN_(nscoord)   GetLengthTwips(nsPresContext* aPresContext) const;
+  NS_HIDDEN_(nscoord)   GetLengthTwips() const;
 
   NS_HIDDEN_(void)  Reset()  // sets to null
   {
diff --git a/mozilla/layout/style/nsRuleNode.cpp b/mozilla/layout/style/nsRuleNode.cpp
index 99f8a3a16fe..c77ba74a259 100644
--- a/mozilla/layout/style/nsRuleNode.cpp
+++ b/mozilla/layout/style/nsRuleNode.cpp
@@ -196,7 +196,7 @@ nscoord CalcLength(const nsCSSValue& aValue,
 {
   NS_ASSERTION(aValue.IsLengthUnit(), "not a length unit");
   if (aValue.IsFixedLengthUnit()) {
-    return aValue.GetLengthTwips(aPresContext);
+    return aValue.GetLengthTwips();
   }
   nsCSSUnit unit = aValue.GetUnit();
   if (unit == eCSSUnit_Pixel) {