Make ResourceFetcher::m_documentResources use WeakPtr

third_party/WebKit/Source/core/page/Page.cpp

Index: third_party/WebKit/Source/core/page/Page.cpp
diff --git a/third_party/WebKit/Source/core/page/Page.cpp b/third_party/WebKit/Source/core/page/Page.cpp
index 037913400a533a017c86ab3ddb1bc1688c07e2ea..b6eaf46a9dc3f9b34b019fbf67c0aba53c1ac03a 100644
--- a/third_party/WebKit/Source/core/page/Page.cpp
+++ b/third_party/WebKit/Source/core/page/Page.cpp
@@ -514,12 +514,8 @@ void Page::acceptLanguagesChanged()
 
 void Page::purgeMemory(DeviceKind deviceKind)
 {
-    Frame* frame = mainFrame();
-    if (deviceKind != DeviceKind::LowEnd || !frame || !frame->isLocalFrame())
-        return;
-    if (Document* document = toLocalFrame(frame)->document())
-        document->fetcher()->garbageCollectDocumentResources();
-    memoryCache()->pruneAll();
+    if (deviceKind == DeviceKind::LowEnd)
+        memoryCache()->pruneAll();
 }
 
 DEFINE_TRACE(Page)