Add move constructor in ScopedClosureRunner.

base/callback_helpers.cc

Index: base/callback_helpers.cc
diff --git a/base/callback_helpers.cc b/base/callback_helpers.cc
index ef02b2bde0cdfed5dbd02cb97cabd246ea18d611..8fd3dde6ca49089e9e4cc66e0089706f902ae678 100644
--- a/base/callback_helpers.cc
+++ b/base/callback_helpers.cc
@@ -8,18 +8,25 @@
 
 namespace base {
 
-ScopedClosureRunner::ScopedClosureRunner() {
-}
+ScopedClosureRunner::ScopedClosureRunner() {}
 
 ScopedClosureRunner::ScopedClosureRunner(const Closure& closure)
-    : closure_(closure) {
-}
+    : closure_(closure) {}
 
 ScopedClosureRunner::~ScopedClosureRunner() {
   if (!closure_.is_null())
     closure_.Run();
 }
 
+ScopedClosureRunner::ScopedClosureRunner(ScopedClosureRunner&& other)
+    : closure_(other.Release()) {}
+
+ScopedClosureRunner& ScopedClosureRunner::operator=(
+    ScopedClosureRunner&& other) {
+  Reset(other.Release());
+  return *this;
+}
+
 void ScopedClosureRunner::Reset() {
   Closure old_closure = Release();
   if (!old_closure.is_null())