Make stylesheet owner node a reference instead of pointer.

third_party/WebKit/Source/core/css/CSSStyleSheetResourceTest.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/fetch/CSSStyleSheetResource.h"
 
 #include "core/css/CSSCrossfadeValue.h"
 #include "core/css/CSSImageValue.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSProperty.h"
@@ skipping 30 matching lines @@
 class Document;
 
 namespace {
 
 class CSSStyleSheetResourceTest : public ::testing::Test {
 protected:
     CSSStyleSheetResourceTest()
     {
         m_originalMemoryCache = replaceMemoryCacheForTesting(MemoryCache::create());
         m_page = DummyPageHolder::create();
-        document()->setURL(KURL(KURL(), "https://localhost/"));
+        document().setURL(KURL(KURL(), "https://localhost/"));
     }
 
     ~CSSStyleSheetResourceTest() override
     {
         replaceMemoryCacheForTesting(m_originalMemoryCache.release());
     }
 
-    Document* document() { return &m_page->document(); }
+    Document& document() { return m_page->document(); }
 
     Persistent<MemoryCache> m_originalMemoryCache;
     std::unique_ptr<DummyPageHolder> m_page;
 };
 
 TEST_F(CSSStyleSheetResourceTest, PruneCanCauseEviction)
 {
     {
         // We need this scope to remove all references.
         KURL imageURL(KURL(), "https://localhost/image");
         KURL cssURL(KURL(), "https://localhost/style.css");
 
         // We need to disable loading because we manually give a response to
         // the image resource.
-        document()->fetcher()->setAutoLoadImages(false);
+        document().fetcher()->setAutoLoadImages(false);
 
         CSSStyleSheetResource* cssResource = CSSStyleSheetResource::createForTest(ResourceRequest(cssURL), "utf-8");
         memoryCache()->add(cssResource);
         cssResource->responseReceived(ResourceResponse(cssURL, "style/css", 0, nullAtom, String()), nullptr);
         cssResource->finish();
 
         StyleSheetContents* contents = StyleSheetContents::create(CSSParserContext(HTMLStandardMode, nullptr));
         CSSStyleSheet* sheet = CSSStyleSheet::create(contents, document());
         EXPECT_TRUE(sheet);
         CSSCrossfadeValue* crossfade = CSSCrossfadeValue::create(
             CSSImageValue::create(String("image"), imageURL),
             CSSImageValue::create(String("image"), imageURL),
             CSSPrimitiveValue::create(1.0, CSSPrimitiveValue::UnitType::Number));
         Vector<std::unique_ptr<CSSParserSelector>> selectors;
         selectors.append(wrapUnique(new CSSParserSelector()));
         selectors[0]->setMatch(CSSSelector::Id);
         selectors[0]->setValue("foo");
         CSSProperty property(CSSPropertyBackground, *crossfade);
         contents->parserAppendRule(
             StyleRule::create(CSSSelectorList::adoptSelectorVector(selectors), ImmutableStylePropertySet::create(&property, 1, HTMLStandardMode)));
 
-        crossfade->loadSubimages(document());
+        // TODO(rune@opera.com): loadSubimages should take Document&.
+        crossfade->loadSubimages(&document());
         Resource* imageResource = memoryCache()->resourceForURL(imageURL, MemoryCache::defaultCacheIdentifier());
         ASSERT_TRUE(imageResource);
         ResourceResponse imageResponse;
         imageResponse.setURL(imageURL);
         imageResponse.setHTTPHeaderField("cache-control", "no-store");
         imageResource->responseReceived(imageResponse, nullptr);
 
         contents->checkLoaded();
         cssResource->saveParsedStyleSheet(contents);
 
@@ skipping 42 matching lines @@
     // The underlying |contents| for the stylesheet resource must have a
     // matching reference status.
     EXPECT_TRUE(memoryCache()->contains(imageResource));
     EXPECT_FALSE(memoryCache()->contains(cssResource));
     EXPECT_FALSE(contents->isReferencedFromResource());
     EXPECT_FALSE(cssResource->restoreParsedStyleSheet(parserContext));
 }
 
 } // namespace
 } // namespace blink