diff --git a/mozilla/layout/html/base/src/nsBodyFrame.cpp b/mozilla/layout/html/base/src/nsBodyFrame.cpp
index f10275c8fb9..9f8d7ecc349 100644
--- a/mozilla/layout/html/base/src/nsBodyFrame.cpp
+++ b/mozilla/layout/html/base/src/nsBodyFrame.cpp
@@ -197,26 +197,8 @@ NS_METHOD nsBodyFrame::ResizeReflow(nsIPresContext*  aPresContext,
     SetLastContentOffset(mFirstChild);
 
     // Return our desired size. Take into account the y-most floater
-#if 0
-    aDesiredSize.width = desiredRect.XMost();
-    aDesiredSize.height = PR_MAX(desiredRect.YMost(), mSpaceManager->YMost());
-
-    if (!isPseudoFrame) {
-      aDesiredSize.width += mySpacing->mBorderPadding.left + mySpacing->mBorderPadding.right;
-      aDesiredSize.height += mySpacing->mBorderPadding.top + mySpacing->mBorderPadding.bottom;
-    }
-#else
-    aDesiredSize.height = PR_MAX(desiredRect.YMost(), mSpaceManager->YMost());
-    if (isPseudoFrame) {
-      aDesiredSize.width = desiredRect.XMost();
-    } else {
-      aDesiredSize.width = aMaxSize.width;
-      aDesiredSize.height += mySpacing->mBorderPadding.top +
-        mySpacing->mBorderPadding.bottom;
-    }
-#endif
-    aDesiredSize.ascent = aDesiredSize.height;
-    aDesiredSize.descent = 0;
+    ComputeDesiredSize(desiredRect, aMaxSize, mySpacing,
+                       isPseudoFrame, aDesiredSize);
   }
 
   return NS_OK;
@@ -309,21 +291,30 @@ NS_METHOD nsBodyFrame::IncrementalReflow(nsIPresContext*  aPresContext,
   SetLastContentOffset(mFirstChild);
 
   // Return our desired size
-  aDesiredSize.height = PR_MAX(aDesiredRect.YMost(), mSpaceManager->YMost());
-  if (isPseudoFrame) {
-    aDesiredSize.width = aDesiredRect.XMost();
-  } else {
-    aDesiredSize.width = aMaxSize.width;
-    aDesiredSize.height += mySpacing->mBorderPadding.top +
-      mySpacing->mBorderPadding.bottom;
-  }
-  aDesiredSize.ascent = aDesiredSize.height;
-  aDesiredSize.descent = 0;
+  ComputeDesiredSize(aDesiredRect, aMaxSize, mySpacing,
+                     isPseudoFrame, aDesiredSize);
 
   mSpaceManager->Translate(-leftInset, -topInset);
   return NS_OK;
 }
 
+void
+nsBodyFrame::ComputeDesiredSize(const nsRect& aDesiredRect,
+                                const nsSize& aMaxSize,
+                                nsStyleSpacing* aSpacing,
+                                PRBool aIsPseudoFrame,
+                                nsReflowMetrics& aDesiredSize)
+{
+  aDesiredSize.height = PR_MAX(aDesiredRect.YMost(), mSpaceManager->YMost());
+  aDesiredSize.width = PR_MAX(aDesiredRect.XMost(), aMaxSize.width);
+  if (!aIsPseudoFrame) {
+    aDesiredSize.height += aSpacing->mBorderPadding.top +
+      aSpacing->mBorderPadding.bottom;
+  }
+  aDesiredSize.ascent = aDesiredSize.height;
+  aDesiredSize.descent = 0;
+}
+
 NS_METHOD nsBodyFrame::ContentAppended(nsIPresShell*   aShell,
                                        nsIPresContext* aPresContext,
                                        nsIContent*     aContainer)
diff --git a/mozilla/layout/html/base/src/nsBodyFrame.h b/mozilla/layout/html/base/src/nsBodyFrame.h
index 1c5eee8c5f8..634a82fe7b0 100644
--- a/mozilla/layout/html/base/src/nsBodyFrame.h
+++ b/mozilla/layout/html/base/src/nsBodyFrame.h
@@ -73,6 +73,12 @@ protected:
 
   ~nsBodyFrame();
 
+  void ComputeDesiredSize(const nsRect& aDesiredRect,
+                          const nsSize& aMaxSize,
+                          nsStyleSpacing* aSpacing,
+                          PRBool aIsPseudoFrame,
+                          nsReflowMetrics& aDesiredSize);
+
   virtual PRIntn GetSkipSides() const;
 
 private: