Replace RenderArena with PartitionAlloc.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 6f0e65b65d5f8070dafac6d173eb755a75ec4c26..72e935e22c7b6f8654d2133ac90ba3445c3a2fb6 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -173,7 +173,6 @@
 #include "core/rendering/FlowThreadController.h"
 #include "core/rendering/HitTestRequest.h"
 #include "core/rendering/HitTestResult.h"
-#include "core/rendering/RenderArena.h"
 #include "core/rendering/RenderLayerCompositor.h"
 #include "core/rendering/RenderNamedFlowThread.h"
 #include "core/rendering/RenderTextControl.h"
@@ -570,8 +569,6 @@ Document::~Document()
     ASSERT(!m_parser || m_parser->refCount() == 1);
     detachParser();
 
-    m_renderArena.clear();
-
     if (this == topDocument())
         clearAXObjectCache();
 
@@ -1707,8 +1704,7 @@ void Document::recalcStyle(StyleChange change)
             frameView->beginDeferredRepaints();
         }
 
-        ASSERT(!renderer() || renderArena());
-        if (!renderer() || !renderArena())
+        if (!renderer())
             goto bailOut;
 
         if (m_pendingStyleRecalcShouldForce)
@@ -1928,11 +1924,8 @@ void Document::attach(const AttachContext& context)
     ASSERT(!attached());
     ASSERT(!m_axObjectCache || this != topDocument());
 
-    if (!m_renderArena)
-        m_renderArena = RenderArena::create();
-
     // Create the rendering tree
-    setRenderer(new (m_renderArena.get()) RenderView(this));
+    setRenderer(new RenderView(this));
     renderView()->setIsInWindow(true);
 
     recalcStyle(Force);
@@ -1997,7 +1990,6 @@ void Document::detach(const AttachContext& context)
     // or this setting of the frame to 0 could be made explicit in each of the
     // callers of Document::detach().
     m_frame = 0;
-    m_renderArena.clear();
 
     if (m_mediaQueryMatcher)
         m_mediaQueryMatcher->documentDestroyed();
@@ -5131,7 +5123,6 @@ void Document::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
     info.addMember(m_visitedLinkState, "visitedLinkState");
     info.addMember(m_styleRecalcTimer, "styleRecalcTimer");
     info.addMember(m_titleElement, "titleElement");
-    info.ignoreMember(m_renderArena);
     info.addMember(m_axObjectCache, "axObjectCache");
     info.addMember(m_markers, "markers");
     info.addMember(m_cssTarget, "cssTarget");