Move base::WeakPtrFactory's ctor and dtor out-of-line

base/memory/weak_ptr.cc

Index: base/memory/weak_ptr.cc
diff --git a/base/memory/weak_ptr.cc b/base/memory/weak_ptr.cc
index c179b80097cc674e1ad2e484b99909166dda860a..b6e997be64c576ae446deb9853995ea83e64f4f8 100644
--- a/base/memory/weak_ptr.cc
+++ b/base/memory/weak_ptr.cc
@@ -77,5 +77,11 @@ WeakPtrBase::~WeakPtrBase() {
 WeakPtrBase::WeakPtrBase(const WeakReference& ref) : ref_(ref) {
 }
 
+WeakPtrFactoryBase::WeakPtrFactoryBase(uintptr_t ptr) : ptr_(ptr) {}
+
+WeakPtrFactoryBase::~WeakPtrFactoryBase() {
+  ptr_ = 0;
+}
+
 }  // namespace internal
 }  // namespace base