Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/html/LinkManifest.h

Index: third_party/WebKit/Source/core/html/LinkManifest.h
diff --git a/third_party/WebKit/Source/core/html/LinkManifest.h b/third_party/WebKit/Source/core/html/LinkManifest.h
index 7fbcc1cd184e2ec45baf95c15bb598ee0486dd4d..fd55669fc0e02e21f3c5c3a0370232afb4789edb 100644
--- a/third_party/WebKit/Source/core/html/LinkManifest.h
+++ b/third_party/WebKit/Source/core/html/LinkManifest.h
@@ -15,10 +15,9 @@ namespace blink {
 class HTMLLinkElement;
 
 class LinkManifest final : public LinkResource {
-    USING_FAST_MALLOC_WILL_BE_REMOVED(LinkManifest);
 public:
 
-    static PassOwnPtrWillBeRawPtr<LinkManifest> create(HTMLLinkElement* owner);
+    static RawPtr<LinkManifest> create(HTMLLinkElement* owner);
 
     ~LinkManifest() override;