Add a generated ComputedStyleBase class that ComputedStyle extends

third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp b/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
index 04a64fc4c7a0eeef79cd52b6e0f34d65fe4be1e4..8905d091bce27a3401b0b2131877252b7d7fa1b5 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
@@ -753,7 +753,7 @@ PassRefPtr<ComputedStyle> StyleResolver::styleForElement(Element* element, const
     } else {
         if (state.parentStyle()) {
             RefPtr<ComputedStyle> style = ComputedStyle::create();
-            style->inheritFrom(*state.parentStyle(), isAtShadowBoundary(element) ? ComputedStyle::AtShadowBoundary : ComputedStyle::NotAtShadowBoundary);
+            style->inheritFrom(*state.parentStyle(), isAtShadowBoundary(element) ? ComputedStyleBase::AtShadowBoundary : ComputedStyleBase::NotAtShadowBoundary);
             state.setStyle(style.release());
         } else {
             state.setStyle(initialStyleForElement());