Remove some dated Member friendships.

third_party/WebKit/Source/platform/heap/Member.h

Index: third_party/WebKit/Source/platform/heap/Member.h
diff --git a/third_party/WebKit/Source/platform/heap/Member.h b/third_party/WebKit/Source/platform/heap/Member.h
index b2bac898b0c9e4b65564bf2e4e3e53dca4d4bd83..a4d34431b702ffc6c172fbbf426c5ecba98b8930 100644
--- a/third_party/WebKit/Source/platform/heap/Member.h
+++ b/third_party/WebKit/Source/platform/heap/Member.h
@@ -179,14 +179,6 @@ class MemberBase {
 #if DCHECK_IS_ON()
   const ThreadState* m_creationThreadState;
 #endif
-
-  template <bool x,
-            WTF::WeakHandlingFlag y,
-            WTF::ShouldWeakPointersBeMarkedStrongly z,
-            typename U,
-            typename V>
-  friend struct CollectionBackingTraceTrait;
-  friend class Visitor;
 };
 
 // Members are used in classes to contain strong pointers to other oilpan heap
@@ -240,15 +232,6 @@ class Member : public MemberBase<T, TracenessMemberConfiguration::Traced> {
     Parent::operator=(nullptr);
     return *this;
   }
-
- protected:
-  template <bool x,
-            WTF::WeakHandlingFlag y,
-            WTF::ShouldWeakPointersBeMarkedStrongly z,
-            typename U,
-            typename V>
-  friend struct CollectionBackingTraceTrait;
-  friend class Visitor;
 };
 
 // A checked version of Member<>, verifying that only same-thread references
@@ -333,15 +316,6 @@ class SameThreadCheckedMember : public Member<T> {
     return *this;
   }
 
- protected:
-  template <bool x,
-            WTF::WeakHandlingFlag y,
-            WTF::ShouldWeakPointersBeMarkedStrongly z,
-            typename U,
-            typename V>
-  friend struct CollectionBackingTraceTrait;
-  friend class Visitor;
-
  private:
   void checkPointer() {
     if (!this->m_raw)