DevTools: never iterate over css source data and cssom rules in the same loop.

Source/core/inspector/InspectorStyleSheet.h

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 130 matching lines @@
     PassRefPtr<TypeBuilder::CSS::SourceRange> mediaQueryExpValueSourceRange(CSSRule*, size_t mediaQueryIndex, size_t mediaQueryExpIndex);
 
     bool isInlineStyle() override { return false; }
     const CSSRuleVector& flatRules();
 
 protected:
     virtual PassRefPtrWillBeRawPtr<InspectorStyle> inspectorStyle(RefPtrWillBeRawPtr<CSSStyleDeclaration>) override;
 
 private:
     InspectorStyleSheet(InspectorResourceAgent*, const String& id, PassRefPtrWillBeRawPtr<CSSStyleSheet> pageStyleSheet, TypeBuilder::CSS::StyleSheetOrigin::Enum, const String& documentURL, InspectorCSSAgent*);
-    unsigned ruleIndexBySourceRange(CSSMediaRule* parentMediaRule, const SourceRange&);
+    RefPtrWillBeRawPtr<CSSRuleSourceData> ruleAfterSourceRange(const SourceRange&);
     RefPtrWillBeRawPtr<CSSRuleSourceData> findRuleByHeaderRange(const SourceRange&);
     RefPtrWillBeRawPtr<CSSRuleSourceData> findRuleByBodyRange(const SourceRange&);
     RefPtrWillBeRawPtr<CSSRule> ruleForSourceData(CSSRuleSourceData*);
     RefPtrWillBeRawPtr<CSSRuleSourceData> sourceDataForRule(CSSRule*);
-    CSSStyleRule* insertCSSOMRuleInStyleSheet(const SourceRange&, const String& ruleText, ExceptionState&);
-    CSSStyleRule* insertCSSOMRuleInMediaRule(CSSMediaRule*, const SourceRange&, const String& ruleText, ExceptionState&);
+    CSSStyleRule* insertCSSOMRuleInStyleSheet(CSSRule* insertBefore, const String& ruleText, ExceptionState&);
+    CSSStyleRule* insertCSSOMRuleInMediaRule(CSSMediaRule*, CSSRule* insertBefore, const String& ruleText, ExceptionState&);
     CSSStyleRule* insertCSSOMRuleBySourceRange(const SourceRange&, const String& ruleText, ExceptionState&);
     String sourceMapURL();
     String sourceURL();
     void collectFlatRules();
     bool resourceStyleSheetText(String* result);
     bool inlineStyleSheetText(String* result);
     PassRefPtr<TypeBuilder::Array<TypeBuilder::CSS::Selector>> selectorsFromSource(CSSRuleSourceData*, const String&);
     PassRefPtr<TypeBuilder::CSS::SelectorList> buildObjectForSelectorList(CSSStyleRule*);
     String url();
     bool hasSourceURL();
@@ skipping 35 matching lines @@
     InspectorStyleSheetForInlineStyle(const String& id, PassRefPtrWillBeRawPtr<Element>, Listener*);
     const String& elementStyleText();
 
     RefPtrWillBeMember<Element> m_element;
     RefPtrWillBeMember<InspectorStyle> m_inspectorStyle;
 };
 
 } // namespace blink
 
 #endif // !defined(InspectorStyleSheet_h)