WTF: Implement move of Deques.

third_party/WebKit/Source/wtf/HashMapTest.cpp

Index: third_party/WebKit/Source/wtf/HashMapTest.cpp
diff --git a/third_party/WebKit/Source/wtf/HashMapTest.cpp b/third_party/WebKit/Source/wtf/HashMapTest.cpp
index 540331424df431ccff4006a676cf86fb2eff1733..d12d81ef299922e0f566edb793b9174a266b4f5c 100644
--- a/third_party/WebKit/Source/wtf/HashMapTest.cpp
+++ b/third_party/WebKit/Source/wtf/HashMapTest.cpp
@@ -478,11 +478,19 @@ class CountCopy final {
 public:
     CountCopy() : m_counter(nullptr) { }
     explicit CountCopy(int& counter) : m_counter(&counter) { }
-    CountCopy(const CountCopy& other) : m_counter(other.m_counter)
+    CountCopy(const CountCopy& other)
+        : m_counter(other.m_counter)
     {
         if (m_counter)
             ++*m_counter;
     }
+    CountCopy& operator=(const CountCopy& other)
+    {
+        m_counter = other.m_counter;
+        if (m_counter)
+            ++*m_counter;
+        return *this;
+    }
 
 private:
     int* m_counter;