More nsIPresContext deCOMtamination (bug 229371). Removed GetBaseURL, rename GetMedium to Medium and inline it, remove virtual style resolution methods that forward to style set (callers will call style set methods directly). Removed PresContext parameter to StyleSet style resolution functions. r+sr=dbaron.

layout/forms/nsButtonFrameRenderer.cpp

@@ -43,6 +43,7 @@
 #include "nsHTMLAtoms.h"
 #include "nsCSSPseudoElements.h"
 #include "nsINameSpaceManager.h"
+#include "nsStyleSet.h"
 
 #define ACTIVE   "active"
 #define HOVER    "hover"
@@ -309,16 +310,17 @@ nsButtonFrameRenderer::ReResolveStyles(nsIPresContext* aPresContext)
 {
   // get all the styles
   nsStyleContext* context = mFrame->GetStyleContext();
+  nsStyleSet *styleSet = aPresContext->StyleSet();
 
   // style for the inner such as a dotted line (Windows)
-  mInnerFocusStyle = aPresContext->ProbePseudoStyleContextFor(mFrame->GetContent(),
-                                                              nsCSSPseudoElements::mozFocusInner,
-                                                              context);
+  mInnerFocusStyle = styleSet->ProbePseudoStyleFor(mFrame->GetContent(),
+                                                   nsCSSPseudoElements::mozFocusInner,
+                                                   context);
 
   // style for outer focus like a ridged border (MAC).
-  mOuterFocusStyle = aPresContext->ProbePseudoStyleContextFor(mFrame->GetContent(),
-                                                              nsCSSPseudoElements::mozFocusOuter,
-                                                              context);
+  mOuterFocusStyle = styleSet->ProbePseudoStyleFor(mFrame->GetContent(),
+                                                   nsCSSPseudoElements::mozFocusOuter,
+                                                   context);
 }
 
 nsStyleContext*