Make CSSParserContext be garbage collected.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/StyleEngine.h"
 
 #include "core/css/StyleSheetContents.h"
 #include "core/css/parser/CSSParserContext.h"
 #include "core/dom/Document.h"
 #include "core/dom/NodeComputedStyle.h"
@@ skipping 31 matching lines @@
 };
 
 void StyleEngineTest::SetUp() {
   m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
 }
 
 StyleEngineTest::RuleSetInvalidation
 StyleEngineTest::scheduleInvalidationsForRules(TreeScope& treeScope,
                                                const String& cssText) {
   StyleSheetContents* sheet =
-      StyleSheetContents::create(CSSParserContext(HTMLStandardMode, nullptr));
+      StyleSheetContents::create(CSSParserContext::create(HTMLStandardMode));
   sheet->parseString(cssText);
   HeapHashSet<Member<RuleSet>> ruleSets;
   RuleSet& ruleSet = sheet->ensureRuleSet(MediaQueryEvaluator(),
                                           RuleHasDocumentSecurityOrigin);
   ruleSet.compactRulesIfNeeded();
   if (ruleSet.needsFullRecalcForRuleSetInvalidation())
     return RuleSetInvalidationFullRecalc;
   ruleSets.add(&ruleSet);
   styleEngine().scheduleInvalidationsForRuleSets(treeScope, ruleSets);
   return RuleSetInvalidationsScheduled;
 }
 
 TEST_F(StyleEngineTest, DocumentDirtyAfterInject) {
   StyleSheetContents* parsedSheet =
-      StyleSheetContents::create(CSSParserContext(document(), nullptr));
+      StyleSheetContents::create(CSSParserContext::create(document()));
   parsedSheet->parseString("div {}");
   styleEngine().injectAuthorSheet(parsedSheet);
   document().view()->updateAllLifecyclePhases();
 
   EXPECT_TRUE(isDocumentStyleSheetCollectionClean());
 }
 
 TEST_F(StyleEngineTest, AnalyzedInject) {
   document().body()->setInnerHTML(
       "<style>div { color: red }</style><div id='t1'>Green</div><div></div>");
   document().view()->updateAllLifecyclePhases();
 
   Element* t1 = document().getElementById("t1");
   ASSERT_TRUE(t1);
   ASSERT_TRUE(t1->computedStyle());
   EXPECT_EQ(makeRGB(255, 0, 0),
             t1->computedStyle()->visitedDependentColor(CSSPropertyColor));
 
   unsigned beforeCount = styleEngine().styleForElementCount();
 
   StyleSheetContents* parsedSheet =
-      StyleSheetContents::create(CSSParserContext(document(), nullptr));
+      StyleSheetContents::create(CSSParserContext::create(document()));
   parsedSheet->parseString("#t1 { color: green }");
   styleEngine().injectAuthorSheet(parsedSheet);
   document().view()->updateAllLifecyclePhases();
 
   unsigned afterCount = styleEngine().styleForElementCount();
   EXPECT_EQ(1u, afterCount - beforeCount);
 
   ASSERT_TRUE(t1->computedStyle());
   EXPECT_EQ(makeRGB(0, 128, 0),
             t1->computedStyle()->visitedDependentColor(CSSPropertyColor));
@@ skipping 267 matching lines @@
 
   unsigned afterCount = styleEngine().styleForElementCount();
   EXPECT_EQ(0u, afterCount - beforeCount);
 
   ASSERT_TRUE(t1->computedStyle());
   EXPECT_EQ(makeRGB(0, 128, 0),
             t1->computedStyle()->visitedDependentColor(CSSPropertyColor));
 }
 
 }  // namespace blink