Removing (dest != prev) check from LastUnique algorithm.

base/containers/container_test_utils.h

Index: base/containers/container_test_utils.h
diff --git a/base/containers/container_test_utils.h b/base/containers/container_test_utils.h
index e36b9f731252a92510d481028299c1523a48b8c4..251e2a03d4f664c252f20a250c2f9ff4671ddc3a 100644
--- a/base/containers/container_test_utils.h
+++ b/base/containers/container_test_utils.h
@@ -22,10 +22,30 @@ class MoveOnlyInt {
     return *this;
   }
 
+  friend bool operator==(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) {
+    return lhs.data_ == rhs.data_;
+  }
+
+  friend bool operator!=(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) {
+    return !operator==(lhs, rhs);
+  }
+
   friend bool operator<(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) {
     return lhs.data_ < rhs.data_;
   }
 
+  friend bool operator>(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) {
+    return rhs < lhs;
+  }
+
+  friend bool operator<=(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) {
+    return !(rhs < lhs);
+  }
+
+  friend bool operator>=(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) {
+    return !(lhs < rhs);
+  }
+
   int data() const { return data_; }
 
  private: