Use hash set instead of vector for changed RuleSets.

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/dom/Document.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/shadow/ShadowRootInit.h"
@@ skipping 32 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));
   sheet->parseString(cssText);
-  HeapVector<Member<RuleSet>> ruleSets;
+  HeapHashSet<Member<RuleSet>> ruleSets;
   RuleSet& ruleSet = sheet->ensureRuleSet(MediaQueryEvaluator(),
                                           RuleHasDocumentSecurityOrigin);
   ruleSet.compactRulesIfNeeded();
   if (ruleSet.needsFullRecalcForRuleSetInvalidation())
     return RuleSetInvalidationFullRecalc;
-  ruleSets.append(&ruleSet);
+  ruleSets.add(&ruleSet);
   styleEngine().scheduleInvalidationsForRuleSets(treeScope, ruleSets);
   return RuleSetInvalidationsScheduled;
 }
 
 TEST_F(StyleEngineTest, DocumentDirtyAfterInject) {
   StyleSheetContents* parsedSheet =
       StyleSheetContents::create(CSSParserContext(document(), nullptr));
   parsedSheet->parseString("div {}");
   styleEngine().injectAuthorSheet(parsedSheet);
   document().view()->updateAllLifecyclePhases();
@@ skipping 298 matching lines @@
   unsigned afterCount = styleEngine().styleForElementCount();
   // TODO(rune@opera.com): Should be 0 for ruleset based invalidations.
   EXPECT_EQ(8u, afterCount - beforeCount);
 
   ASSERT_TRUE(t1->computedStyle());
   EXPECT_EQ(makeRGB(0, 128, 0),
             t1->computedStyle()->visitedDependentColor(CSSPropertyColor));
 }
 
 }  // namespace blink