Remove fallback matching ::cue* pseudo-element selectors

Because there is a "cue" entry in both pseudoTypeWithoutArgumentsMap and
pseudoTypeWithArgumentsMap, this path is never taken (verified with
ASSERT(0)) when running LayoutTests/media/.

It is taken for something like ::cuefoo, but that makes no sense.

This was initially the only code path:
http://trac.webkit.org/changeset/136991

Later commits made it obsolete:
http://trac.webkit.org/changeset/137955
https://src.chromium.org/viewvc/blink?revision=155834&view=revision

This was the last usage of PseudoUserAgentCustomElement, so remove that
too, together with its use counter:
https://src.chromium.org/viewvc/blink?revision=155928&view=revision
https://www.chromestatus.com/metrics/feature/timeline/popularity/103

At the time pseudos starting with "x-" were also
PseudoUserAgentCustomElement, but has since been removed:
https://src.chromium.org/viewvc/blink?revision=170210&view=revision

Review URL: https://codereview.chromium.org/646853007

git-svn-id: svn://svn.chromium.org/blink/trunk@184341 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/css/CSSSelector.cpp

@@ -242,7 +242,6 @@ PseudoId CSSSelector::pseudoId(PseudoType type)
     case PseudoRightPage:
     case PseudoInRange:
     case PseudoOutOfRange:
-    case PseudoUserAgentCustomElement:
     case PseudoWebKitCustomElement:
     case PseudoCue:
     case PseudoFutureCue:
@@ -443,8 +442,6 @@ CSSSelector::PseudoType CSSSelector::parsePseudoType(const AtomicString& name, b
 
     if (name.startsWith("-webkit-"))
         return PseudoWebKitCustomElement;
-    if (name.startsWith("cue"))
-        return PseudoUserAgentCustomElement;
 
     return PseudoUnknown;
 }
@@ -476,7 +473,6 @@ void CSSSelector::extractPseudoType() const
     case PseudoScrollbarTrack:
     case PseudoScrollbarTrackPiece:
     case PseudoSelection:
-    case PseudoUserAgentCustomElement:
     case PseudoWebKitCustomElement:
     case PseudoContent:
     case PseudoShadow:

third_party/WebKit/Source/core/css/CSSSelector.h

@@ -205,7 +205,6 @@ namespace blink {
             PseudoFullScreenAncestor,
             PseudoInRange,
             PseudoOutOfRange,
-            PseudoUserAgentCustomElement,
             PseudoWebKitCustomElement,
             PseudoCue,
             PseudoFutureCue,
@@ -405,7 +404,7 @@ inline bool CSSSelector::matchesPseudoElement() const
 
 inline bool CSSSelector::isCustomPseudoElement() const
 {
-    return m_match == PseudoElement && (m_pseudoType == PseudoUserAgentCustomElement || m_pseudoType == PseudoWebKitCustomElement);
+    return m_match == PseudoElement && m_pseudoType == PseudoWebKitCustomElement;
 }
 
 inline bool CSSSelector::isHostPseudoClass() const

third_party/WebKit/Source/core/css/RuleFeature.cpp

@@ -170,7 +170,6 @@ static bool requiresSubtreeInvalidation(const CSSSelector& selector)
     case CSSSelector::PseudoFullScreen:
     case CSSSelector::PseudoFullScreenDocument:
     case CSSSelector::PseudoFullScreenAncestor:
-    case CSSSelector::PseudoUserAgentCustomElement:
     case CSSSelector::PseudoWebKitCustomElement:
     case CSSSelector::PseudoCue:
     case CSSSelector::PseudoFutureCue:

third_party/WebKit/Source/core/css/parser/BisonCSSParser-in.cpp

@@ -923,9 +923,6 @@ CSSParserSelector* BisonCSSParser::rewriteSpecifiersWithElementName(const Atomic
 
 CSSParserSelector* BisonCSSParser::rewriteSpecifiersWithElementNameForCustomPseudoElement(const QualifiedName& tag, const AtomicString& elementName, CSSParserSelector* specifiers, bool tagIsForNamespaceRule)
 {
-    if (m_context.useCounter() && specifiers->pseudoType() == CSSSelector::PseudoUserAgentCustomElement)
-        m_context.useCounter()->count(UseCounter::CSSPseudoElementUserAgentCustomPseudo);
-
     CSSParserSelector* lastShadowPseudo = specifiers;
     CSSParserSelector* history = specifiers;
     while (history->tagHistory()) {

third_party/WebKit/Source/core/dom/Element.cpp

@@ -2372,7 +2372,7 @@ const AtomicString& Element::shadowPseudoId() const
 
 void Element::setShadowPseudoId(const AtomicString& id)
 {
-    ASSERT(CSSSelector::parsePseudoType(id, false) == CSSSelector::PseudoWebKitCustomElement || CSSSelector::parsePseudoType(id, false) == CSSSelector::PseudoUserAgentCustomElement);
+    ASSERT(CSSSelector::parsePseudoType(id, false) == CSSSelector::PseudoWebKitCustomElement);
     setAttribute(pseudoAttr, id);
 }
 

third_party/WebKit/Source/core/frame/UseCounter.h

@@ -134,7 +134,6 @@ public:
         SubFrameBeforeUnloadFired = 98,
         TextReplaceWholeText = 100,
         ConsoleMarkTimeline = 102,
-        CSSPseudoElementUserAgentCustomPseudo = 103,
         ElementGetAttributeNode = 107, // Removed from DOM4.
         ElementSetAttributeNode = 108, // Removed from DOM4.
         ElementRemoveAttributeNode = 109, // Removed from DOM4.

third_party/WebKit/Source/core/inspector/InspectorTraceEvents.cpp

@@ -140,7 +140,6 @@ const char* pseudoTypeToString(CSSSelector::PseudoType pseudoType)
         DEFINE_STRING_MAPPING(PseudoFullScreenAncestor)
         DEFINE_STRING_MAPPING(PseudoInRange)
         DEFINE_STRING_MAPPING(PseudoOutOfRange)
-        DEFINE_STRING_MAPPING(PseudoUserAgentCustomElement)
         DEFINE_STRING_MAPPING(PseudoWebKitCustomElement)
         DEFINE_STRING_MAPPING(PseudoCue)
         DEFINE_STRING_MAPPING(PseudoFutureCue)