Revert of Move HTMLDocument::isCaseSensitiveAttribute into SelectorChecker

third_party/WebKit/Source/core/html/HTMLDocument.cpp

Index: third_party/WebKit/Source/core/html/HTMLDocument.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLDocument.cpp b/third_party/WebKit/Source/core/html/HTMLDocument.cpp
index 1b81adc8e0a6b10cc278c98702eb7f9da89777c3..174b947d02c87ed09ec1bd8dde24a3bde4bd6e70 100644
--- a/third_party/WebKit/Source/core/html/HTMLDocument.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLDocument.cpp
@@ -197,4 +197,40 @@
     removeItemFromMap(m_extraNamedItemCounts, name);
 }
 
+static HashSet<StringImpl*>* createHtmlCaseInsensitiveAttributesSet()
+{
+    // This is the list of attributes in HTML 4.01 with values marked as "[CI]" or case-insensitive
+    // Mozilla treats all other values as case-sensitive, thus so do we.
+    HashSet<StringImpl*>* attrSet = new HashSet<StringImpl*>;
+
+    const QualifiedName* caseInsensitiveAttributes[] = {
+        &accept_charsetAttr, &acceptAttr, &alignAttr, &alinkAttr, &axisAttr,
+        &bgcolorAttr,
+        &charsetAttr, &checkedAttr, &clearAttr, &codetypeAttr, &colorAttr, &compactAttr,
+        &declareAttr, &deferAttr, &dirAttr, &directionAttr, &disabledAttr,
+        &enctypeAttr,
+        &faceAttr, &frameAttr,
+        &hreflangAttr, &http_equivAttr,
+        &langAttr, &languageAttr, &linkAttr,
+        &mediaAttr, &methodAttr, &multipleAttr,
+        &nohrefAttr, &noresizeAttr, &noshadeAttr, &nowrapAttr,
+        &readonlyAttr, &relAttr, &revAttr, &rulesAttr,
+        &scopeAttr, &scrollingAttr, &selectedAttr, &shapeAttr,
+        &targetAttr, &textAttr, &typeAttr,
+        &valignAttr, &valuetypeAttr, &vlinkAttr };
+
+    attrSet->reserveCapacityForSize(WTF_ARRAY_LENGTH(caseInsensitiveAttributes));
+    for (const QualifiedName* attr : caseInsensitiveAttributes)
+        attrSet->add(attr->localName().impl());
+
+    return attrSet;
+}
+
+bool HTMLDocument::isCaseSensitiveAttribute(const QualifiedName& attributeName)
+{
+    static HashSet<StringImpl*>* htmlCaseInsensitiveAttributesSet = createHtmlCaseInsensitiveAttributesSet();
+    bool isPossibleHTMLAttr = !attributeName.hasPrefix() && (attributeName.namespaceURI() == nullAtom);
+    return !isPossibleHTMLAttr || !htmlCaseInsensitiveAttributesSet->contains(attributeName.localName().impl());
+}
+
 } // namespace blink