Remove css !important

sky/engine/core/css/CSSStyleDeclaration.h

Index: sky/engine/core/css/CSSStyleDeclaration.h
diff --git a/sky/engine/core/css/CSSStyleDeclaration.h b/sky/engine/core/css/CSSStyleDeclaration.h
index 16b62117c88f954a3624ebacf90d0241a012cff6..49bfdbef299a6fe4b9c8c55141aff2acd3c3efd4 100644
--- a/sky/engine/core/css/CSSStyleDeclaration.h
+++ b/sky/engine/core/css/CSSStyleDeclaration.h
@@ -51,7 +51,6 @@ public:
     virtual String item(unsigned index) const = 0;
     virtual PassRefPtr<CSSValue> getPropertyCSSValue(const String& propertyName) = 0;
     virtual String getPropertyValue(const String& propertyName) = 0;
-    virtual String getPropertyPriority(const String& propertyName) = 0;
     virtual String getPropertyShorthand(const String& propertyName) = 0;
     virtual bool isPropertyImplicit(const String& propertyName) = 0;
     virtual void setProperty(const String& propertyName, const String& value, const String& priority, ExceptionState&) = 0;
@@ -62,7 +61,7 @@ public:
     // The CSSValue returned by this function should not be exposed to the web as it may be used by multiple documents at the same time.
     virtual PassRefPtr<CSSValue> getPropertyCSSValueInternal(CSSPropertyID) = 0;
     virtual String getPropertyValueInternal(CSSPropertyID) = 0;
-    virtual void setPropertyInternal(CSSPropertyID, const String& value, bool important, ExceptionState&) = 0;
+    virtual void setPropertyInternal(CSSPropertyID, const String& value, ExceptionState&) = 0;
 
     virtual PassRefPtr<MutableStylePropertySet> copyProperties() const = 0;