Land bug 72747 in pieces: Change types on ScrollbarStyles from PRInt32 to...

Land bug 72747 in pieces:  Change types on ScrollbarStyles from PRInt32 to PRUint8.  b=72747  r+sr=roc

layout/base/public/nsIScrollableFrame.h

@@ -67,10 +67,9 @@ public:
 
   struct ScrollbarStyles {
     // one of NS_STYLE_OVERFLOW_SCROLL, NS_STYLE_OVERFLOW_HIDDEN,
-    // NS_STYLE_OVERFLOW_VISIBLE, NS_STYLE_OVERFLOW_AUTO
-    PRInt32 mHorizontal;
-    PRInt32 mVertical;
-    ScrollbarStyles(PRInt32 h, PRInt32 v) : mHorizontal(h), mVertical(v) {}
+    // NS_STYLE_OVERFLOW_AUTO
+    PRUint8 mHorizontal, mVertical;
+    ScrollbarStyles(PRUint8 h, PRUint8 v) : mHorizontal(h), mVertical(v) {}
   };
 
   virtual ScrollbarStyles GetScrollbarStyles() const = 0;

layout/generic/nsIScrollableFrame.h

@@ -67,10 +67,9 @@ public:
 
   struct ScrollbarStyles {
     // one of NS_STYLE_OVERFLOW_SCROLL, NS_STYLE_OVERFLOW_HIDDEN,
-    // NS_STYLE_OVERFLOW_VISIBLE, NS_STYLE_OVERFLOW_AUTO
-    PRInt32 mHorizontal;
-    PRInt32 mVertical;
-    ScrollbarStyles(PRInt32 h, PRInt32 v) : mHorizontal(h), mVertical(v) {}
+    // NS_STYLE_OVERFLOW_AUTO
+    PRUint8 mHorizontal, mVertical;
+    ScrollbarStyles(PRUint8 h, PRUint8 v) : mHorizontal(h), mVertical(v) {}
   };
 
   virtual ScrollbarStyles GetScrollbarStyles() const = 0;