Document* -> Document& for loadSubimages and friends.

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

Index: third_party/WebKit/Source/core/css/CSSImageValue.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSImageValue.cpp b/third_party/WebKit/Source/core/css/CSSImageValue.cpp
index 1fcf9aa859d5e9799847960d0ee452137a001297..c5cfd45d6d2a75e42f7e35a6e23fae10d6c4ddda 100644
--- a/third_party/WebKit/Source/core/css/CSSImageValue.cpp
+++ b/third_party/WebKit/Source/core/css/CSSImageValue.cpp
@@ -54,18 +54,16 @@ CSSImageValue::~CSSImageValue()
 {
 }
 
-StyleImage* CSSImageValue::cacheImage(Document* document, CrossOriginAttributeValue crossOrigin)
+StyleImage* CSSImageValue::cacheImage(const Document& document, CrossOriginAttributeValue crossOrigin)
 {
-    ASSERT(document);
-
     if (!m_cachedImage) {
         FetchRequest request(ResourceRequest(m_absoluteURL), m_initiatorName.isEmpty() ? FetchInitiatorTypeNames::css : m_initiatorName);
         request.mutableResourceRequest().setHTTPReferrer(SecurityPolicy::generateReferrer(m_referrer.referrerPolicy, request.url(), m_referrer.referrer));
 
         if (crossOrigin != CrossOriginAttributeNotSet)
-            request.setCrossOriginAccessControl(document->getSecurityOrigin(), crossOrigin);
+            request.setCrossOriginAccessControl(document.getSecurityOrigin(), crossOrigin);
 
-        if (ImageResource* cachedImage = ImageResource::fetch(request, document->fetcher()))
+        if (ImageResource* cachedImage = ImageResource::fetch(request, document.fetcher()))
             m_cachedImage = StyleFetchedImage::create(cachedImage, document, request.url());
         else
             m_cachedImage = StyleInvalidImage::create(url());
@@ -74,7 +72,7 @@ StyleImage* CSSImageValue::cacheImage(Document* document, CrossOriginAttributeVa
     return m_cachedImage.get();
 }
 
-void CSSImageValue::restoreCachedResourceIfNeeded(Document& document) const
+void CSSImageValue::restoreCachedResourceIfNeeded(const Document& document) const
 {
     if (!m_cachedImage || !document.fetcher() || m_absoluteURL.isNull())
         return;