Refactor XSS Auditor string operations.

Source/core/html/parser/XSSAuditor.h

Index: Source/core/html/parser/XSSAuditor.h
diff --git a/Source/core/html/parser/XSSAuditor.h b/Source/core/html/parser/XSSAuditor.h
index 37e463c8d2bb6373d906d83edddf85227a89cce7..2088806d5ac35930538f1aaac6a457ce2ca4b000 100644
--- a/Source/core/html/parser/XSSAuditor.h
+++ b/Source/core/html/parser/XSSAuditor.h
@@ -76,10 +76,11 @@ private:
         SuppressingAdjacentCharacterTokens
     };
 
-    enum AttributeKind {
-        NormalAttribute,
-        SrcLikeAttribute,
-        ScriptLikeAttribute
+    enum TruncationKind {
+        NoTruncation,
+        NormalAttributeTruncation,
+        SrcLikeAttributeTruncation,
+        ScriptLikeAttributeTruncation
     };
 
     bool filterStartToken(const FilterTokenRequest&);
@@ -98,12 +99,12 @@ private:
     bool filterButtonToken(const FilterTokenRequest&);
 
     bool eraseDangerousAttributesIfInjected(const FilterTokenRequest&);
-    bool eraseAttributeIfInjected(const FilterTokenRequest&, const QualifiedName&, const String& replacementValue = String(), AttributeKind treatment = NormalAttribute);
+    bool eraseAttributeIfInjected(const FilterTokenRequest&, const QualifiedName&, const String& replacementValue = String(), TruncationKind treatment = NormalAttributeTruncation);
 
-    String decodedSnippetForToken(const HTMLToken&);
-    String decodedSnippetForName(const FilterTokenRequest&);
-    String decodedSnippetForAttribute(const FilterTokenRequest&, const HTMLToken::Attribute&, AttributeKind treatment = NormalAttribute);
-    String decodedSnippetForJavaScript(const FilterTokenRequest&);
+    String canonicalizedSnippetForTagName(const FilterTokenRequest&);
+    String canonicalizedSnippetForJavaScript(const FilterTokenRequest&);
+    String snippetFromAttribute(const FilterTokenRequest&, const HTMLToken::Attribute&);
+    String canonicalize(String, TruncationKind);
 
     bool isContainedInRequest(const String&);
     bool isLikelySafeResource(const String& url);