Bug 1448728 part 0 - Remove objects only used in the old style system from nsPresArena::AddSizeOfExcludingThis. r=emilio

This patch was part of Bug 1448535 part 5 and reviewed there. It is
split out because bug 1448728 doesn't need to be blocked by other parts
of bug 1448535.

MozReview-Commit-ID: C74w6FWAxMB

--HG--
extra : source : 1a537bb710a0ab31afdad0ef6e95fee518800737
extra : amend_source : 1dbcd7b3cfb4ccb4732b4a2ba7842436ac4b215d

layout/base/nsPresArena.cpp

@@ -203,12 +203,6 @@ nsPresArena::AddSizeOfExcludingThis(nsWindowSizes& aSizes) const
       case eArenaObjectID_nsLineBox:
         aSizes.mArenaSizes.mLineBoxes += totalSize;
         break;
-      case eArenaObjectID_nsRuleNode:
-        aSizes.mArenaSizes.mRuleNodes += totalSize;
-        break;
-      case eArenaObjectID_GeckoComputedStyle:
-        aSizes.mArenaSizes.mComputedStyles += totalSize;
-        break;
 #define STYLE_STRUCT(name_) \
       case eArenaObjectID_nsStyle##name_: \
         aSizes.mArenaSizes.mGeckoStyleSizes.NS_STYLE_SIZES_FIELD(name_) += \