diff --git a/widget/windows/nsNativeThemeWin.cpp b/widget/windows/nsNativeThemeWin.cpp
index 284c9e58044d..1e4ea50bccaf 100644
--- a/widget/windows/nsNativeThemeWin.cpp
+++ b/widget/windows/nsNativeThemeWin.cpp
@@ -544,88 +544,7 @@ nsNativeThemeWin::CalculateProgressOverlayRect(nsIFrame* aFrame,
 }
 
 /*
- * DrawChunkProgressMeter - renders an xp style chunked progress meter. Called
- * by DrawProgressMeter.
- *
- * @param aTheme       progress theme handle
- * @param aHdc         hdc returned by gfxWindowsNativeDrawing
- * @param aPart        the PP_X progress part
- * @param aState       the theme state
- * @param aFrame       the elements frame
- * @param aWidgetRect  bounding rect for the widget
- * @param aClipRect    dirty rect that needs drawing.
- * @param aAppUnits    app units per device pixel
- * @param aIsIndeterm  is an indeterminate progress?
- * @param aIsVertical  render a vertical progress?
- * @param aIsRtl       direction is rtl
- */
-static void
-DrawChunkProgressMeter(HTHEME aTheme, HDC aHdc, int aPart,
-                       int aState, nsIFrame* aFrame, RECT* aWidgetRect,
-                       RECT* aClipRect, gfxFloat aAppUnits, bool aIsIndeterm,
-                       bool aIsVertical, bool aIsRtl)
-{
-  NS_ASSERTION(aTheme, "Bad theme.");
-  NS_ASSERTION(aHdc, "Bad hdc.");
-  NS_ASSERTION(aWidgetRect, "Bad rect.");
-  NS_ASSERTION(aClipRect, "Bad clip rect.");
-  NS_ASSERTION(aFrame, "Bad frame.");
-
-  // For horizontal meters, the theme lib paints the right graphic but doesn't
-  // paint the chunks, so we do that manually. For vertical meters, the theme
-  // library draws everything correctly.
-  if (aIsVertical) {
-    DrawThemeBackground(aTheme, aHdc, aPart, aState, aWidgetRect, aClipRect);
-    return;
-  }
-
-  // query for the proper chunk metrics
-  int chunkSize, spaceSize;
-  if (FAILED(GetThemeMetric(aTheme, aHdc, aPart, aState,
-                            TMT_PROGRESSCHUNKSIZE, &chunkSize)) ||
-      FAILED(GetThemeMetric(aTheme, aHdc, aPart, aState,
-                            TMT_PROGRESSSPACESIZE, &spaceSize))) {
-    DrawThemeBackground(aTheme, aHdc, aPart, aState, aWidgetRect, aClipRect);
-    return;
-  }
-
-  // render chunks
-  if (!aIsRtl || aIsIndeterm) {
-    for (int chunk = aWidgetRect->left; chunk <= aWidgetRect->right;
-         chunk += (chunkSize+spaceSize)) {
-      if (!aIsIndeterm && ((chunk + chunkSize) > aWidgetRect->right)) {
-        // aWidgetRect->right represents the end of the meter. Partial blocks
-        // don't get rendered with one exception, so exit here if we don't have
-        // a full chunk to draw.
-        // The above is true *except* when the meter is at 100% fill, in which
-        // case Windows renders any remaining partial block. Query the parent
-        // frame to find out if we're at 100%.
-        if (!IsProgressMeterFilled(aFrame)) {
-          break;
-        }
-      }
-      RECT bounds =
-        { chunk, aWidgetRect->top, chunk + chunkSize, aWidgetRect->bottom };
-      DrawThemeBackground(aTheme, aHdc, aPart, aState, &bounds, aClipRect);
-    }
-  } else {
-    // rtl needs to grow in the opposite direction to look right.
-    for (int chunk = aWidgetRect->right; chunk >= aWidgetRect->left;
-         chunk -= (chunkSize+spaceSize)) {
-      if ((chunk - chunkSize) < aWidgetRect->left) {
-        if (!IsProgressMeterFilled(aFrame)) {
-          break;
-        }
-      }
-      RECT bounds =
-        { chunk - chunkSize, aWidgetRect->top, chunk, aWidgetRect->bottom };
-      DrawThemeBackground(aTheme, aHdc, aPart, aState, &bounds, aClipRect);
-    }
-  }
-}
-
-/*
- * DrawProgressMeter - render an appropriate progress meter based on progress
+ * DrawProgressMeter - renders an appropriate progress meter based on progress
  * meter style, orientation, and os. Note, this does not render the underlying
  * progress track.
  *
@@ -684,10 +603,8 @@ nsNativeThemeWin::DrawThemedProgressMeter(nsIFrame* aFrame, int aWidgetType,
       animate = true;
     }
   } else if (!indeterminate) {
-    // XP progress meters are 'chunk' style.
-    DrawChunkProgressMeter(aTheme, aHdc, aPart, aState, aFrame,
-                           &adjWidgetRect, &adjClipRect, aAppUnits,
-                           indeterminate, vertical, IsFrameRTL(aFrame));
+    DrawThemeBackground(aTheme, aHdc, aPart, aState,
+                        &adjWidgetRect, &adjClipRect);
   }    
 
   if (animate) {
@@ -696,14 +613,8 @@ nsNativeThemeWin::DrawThemedProgressMeter(nsIFrame* aFrame, int aWidgetType,
     RECT overlayRect =
       CalculateProgressOverlayRect(aFrame, &adjWidgetRect, vertical,
                                    indeterminate, false);
-    if (WinUtils::GetWindowsVersion() >= WinUtils::VISTA_VERSION) {
-      DrawThemeBackground(aTheme, aHdc, overlayPart, aState, &overlayRect,
-                          &adjClipRect);
-    } else {
-      DrawChunkProgressMeter(aTheme, aHdc, overlayPart, aState, aFrame,
-                             &overlayRect, &adjClipRect, aAppUnits,
-                             indeterminate, vertical, IsFrameRTL(aFrame));
-    }
+    DrawThemeBackground(aTheme, aHdc, overlayPart, aState, &overlayRect,
+                        &adjClipRect);
 
     if (!QueueAnimatedContentForRefresh(aFrame->GetContent(), 60)) {
       NS_WARNING("unable to animate progress widget!");