Remove obsolete WeakPtr hack.

base/memory/weak_ptr.h

Index: base/memory/weak_ptr.h
diff --git a/base/memory/weak_ptr.h b/base/memory/weak_ptr.h
index b4120a1140d109ff89f60e71a55e031e128220c9..b28386f73bad22fb488c88d4d45508a68170993c 100644
--- a/base/memory/weak_ptr.h
+++ b/base/memory/weak_ptr.h
@@ -90,9 +90,6 @@ class BASE_EXPORT WeakReference {
     void Invalidate();
     bool IsValid() const;
 
-    // Remove this when crbug.com/234964 is addressed.
-    void DetachFromThreadHack() { sequence_checker_.DetachFromSequence(); }
-
    private:
     friend class base::RefCountedThreadSafe<Flag>;
 
@@ -125,12 +122,6 @@ class BASE_EXPORT WeakReferenceOwner {
 
   void Invalidate();
 
-  // Remove this when crbug.com/234964 is addressed.
-  void DetachFromThreadHack() {
-    if (flag_.get())
-      flag_->DetachFromThreadHack();
-  }
-
  private:
   mutable scoped_refptr<WeakReference::Flag> flag_;
 };
@@ -311,17 +302,11 @@ class SupportsWeakPtr : public internal::SupportsWeakPtrBase {
     return WeakPtr<T>(weak_reference_owner_.GetRef(), static_cast<T*>(this));
   }
 
-  // Removes the binding, if any, from this object to a particular thread.
-  // This is used in WebGraphicsContext3DInProcessCommandBufferImpl to work-
-  // around access to cmmand buffer objects by more than one thread.
-  // Remove this when crbug.com/234964 is addressed.
-  void DetachFromThreadHack() {
-    weak_reference_owner_.DetachFromThreadHack();
-  }
-
  protected:
   ~SupportsWeakPtr() {}
 
+  void InvalidateWeakPtrs() { weak_reference_owner_.Invalidate(); }
+
  private:
   internal::WeakReferenceOwner weak_reference_owner_;
   DISALLOW_COPY_AND_ASSIGN(SupportsWeakPtr);