Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/css/StyleRuleNamespace.h

Index: third_party/WebKit/Source/core/css/StyleRuleNamespace.h
diff --git a/third_party/WebKit/Source/core/css/StyleRuleNamespace.h b/third_party/WebKit/Source/core/css/StyleRuleNamespace.h
index 1d324da0344883ec483eb40ed08be21b457de713..cd22af5cc0d4f28e7600763bc73f933e9906fbcc 100644
--- a/third_party/WebKit/Source/core/css/StyleRuleNamespace.h
+++ b/third_party/WebKit/Source/core/css/StyleRuleNamespace.h
@@ -12,11 +12,10 @@ namespace blink {
 // This class is never actually stored anywhere currently, but only used for
 // the parser to pass to a stylesheet
 class StyleRuleNamespace final : public StyleRuleBase {
-    USING_FAST_MALLOC_WILL_BE_REMOVED(StyleRuleNamespace);
 public:
-    static PassRefPtrWillBeRawPtr<StyleRuleNamespace> create(AtomicString prefix, AtomicString uri)
+    static RawPtr<StyleRuleNamespace> create(AtomicString prefix, AtomicString uri)
     {
-        return adoptRefWillBeNoop(new StyleRuleNamespace(prefix, uri));
+        return new StyleRuleNamespace(prefix, uri);
     }
 
     AtomicString prefix() const { return m_prefix; }