Remove FontDescriptionChangeScope, and let FontBuilder partially apply values.

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index fd039ac38b58e3e29613f0e80ec0f852397b575c..a31d6bd15db7637af69ee98d71bc5115b53e8b9a 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -714,7 +714,7 @@ PassRefPtrWillBeRawPtr<AnimatableValue> StyleResolver::createAnimatableValueSnap
 PassRefPtrWillBeRawPtr<AnimatableValue> StyleResolver::createAnimatableValueSnapshot(StyleResolverState& state, CSSPropertyID property, CSSValue& value)
 {
     StyleBuilder::applyProperty(property, state, &value);
-    state.fontBuilder().createFont(state.document().styleEngine()->fontSelector(), state.style(), state.parentStyle());
+    state.fontBuilder().createFont(state.document().styleEngine()->fontSelector(), state.style());
     return CSSAnimatableValueFactory::create(property, *state.style());
 }
 
@@ -917,7 +917,7 @@ PassRefPtr<RenderStyle> StyleResolver::defaultStyleForElement()
     RefPtr<RenderStyle> style = RenderStyle::create();
     FontBuilder fontBuilder(document());
     fontBuilder.setInitial(style->effectiveZoom());
-    fontBuilder.createFont(document().styleEngine()->fontSelector(), style.get(), nullptr);
+    fontBuilder.createFont(document().styleEngine()->fontSelector(), style.get());
     return style.release();
 }
 
@@ -933,7 +933,7 @@ PassRefPtr<RenderStyle> StyleResolver::styleForText(Text* textNode)
 
 void StyleResolver::updateFont(StyleResolverState& state)
 {
-    state.fontBuilder().createFont(document().styleEngine()->fontSelector(), state.style(), state.parentStyle());
+    state.fontBuilder().createFont(document().styleEngine()->fontSelector(), state.style());
     state.setConversionFontSizes(CSSToLengthConversionData::FontSizes(state.style(), state.rootElementStyle()));
     state.setConversionZoom(state.style()->effectiveZoom());
 }
@@ -1363,8 +1363,6 @@ void StyleResolver::applyMatchedProperties(StyleResolverState& state, const Matc
             // Unfortunately the link status is treated like an inherited property. We need to explicitly restore it.
             state.style()->setInsideLink(linkStatus);
 
-            state.fontBuilder().setFontDescription(state.style()->fontDescription());
-
             updateFont(state);
 
             return;
@@ -1392,7 +1390,7 @@ void StyleResolver::applyMatchedProperties(StyleResolverState& state, const Matc
     }
 
     if (cachedMatchedProperties && cachedMatchedProperties->renderStyle->effectiveZoom() != state.style()->effectiveZoom()) {
-        state.fontBuilder().setFontDirty(true);
+        state.fontBuilder().didChangeEffectiveZoom();
         applyInheritedOnly = false;
     }