Merge 162300 "Make second argument to CSSStyleSheet.insertRule() optional again"

Source/core/css/CSSStyleSheet.cpp

Index: Source/core/css/CSSStyleSheet.cpp
===================================================================
--- Source/core/css/CSSStyleSheet.cpp	(revision 162716)
+++ Source/core/css/CSSStyleSheet.cpp	(working copy)
@@ -35,6 +35,7 @@
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/Node.h"
+#include "core/page/UseCounter.h"
 #include "weborigin/SecurityOrigin.h"
 #include "wtf/text/StringBuilder.h"
 
@@ -317,6 +318,12 @@
     return index;
 }
 
+unsigned CSSStyleSheet::insertRule(const String& rule, ExceptionState& exceptionState)
+{
+    UseCounter::countDeprecation(activeExecutionContext(), UseCounter::CSSStyleSheetInsertRuleOptionalArg);
+    return insertRule(rule, 0, exceptionState);
+}
+
 void CSSStyleSheet::deleteRule(unsigned index, ExceptionState& es)
 {
     ASSERT(m_childRuleCSSOMWrappers.isEmpty() || m_childRuleCSSOMWrappers.size() == m_contents->ruleCount());