Make WeakPtr use SequenceChecker instead of ThreadChecker

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 7006fb63e0981468e30ac2c631e8d6c1ed645ef7..21951982428555f2e777b6205704bcd10ac64f2c 100644
--- a/base/memory/weak_ptr.h
+++ b/base/memory/weak_ptr.h
@@ -74,8 +74,8 @@
 #include "base/base_export.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
+#include "base/sequence_checker.h"
 #include "base/template_util.h"
-#include "base/threading/thread_checker.h"
 
 namespace base {
 
@@ -97,14 +97,14 @@ class BASE_EXPORT WeakReference {
     void Invalidate();
     bool IsValid() const;
 
-    void DetachFromThread() { thread_checker_.DetachFromThread(); }
+    void DetachFromThread();
 
    private:
     friend class base::RefCountedThreadSafe<Flag>;
 
     ~Flag();
 
-    ThreadChecker thread_checker_;
+    SequenceChecker sequence_checker_;
     bool is_valid_;
   };
 
@@ -245,6 +245,9 @@ class WeakPtr : public internal::WeakPtrBase {
   T* ptr_;
 };
 
+// TODO(akalin): Make WeakPtrFactory and SupportsWeakPtr support

[jar (doing other things), 2013/02/16 02:37:27]

nit: Can you add a bug number.

+// binding to a SequencedTaskRunner instead of just a single thread.
+
 // A class may extend from SupportsWeakPtr to expose weak pointers to itself.
 // This is useful in cases where you want others to be able to get a weak
 // pointer to your class.  It also has the property that you don't need to