base: Fix minor warnings reported by cppcheck.

base/observer_list_unittest.cc

Index: base/observer_list_unittest.cc
diff --git a/base/observer_list_unittest.cc b/base/observer_list_unittest.cc
index f8aff5a7ea548e1401ccb9d21c97a1c51980ed54..8a8521535c29dfaaece311edea2e1f54347dbb7a 100644
--- a/base/observer_list_unittest.cc
+++ b/base/observer_list_unittest.cc
@@ -101,6 +101,7 @@ class AddRemoveThread : public PlatformThread::Delegate,
  public:
   AddRemoveThread(ObserverListThreadSafe<Foo>* list, bool notify)
       : list_(list),
+        loop_(NULL),
         in_list_(false),
         start_(Time::Now()),
         count_observes_(0),
@@ -529,7 +530,7 @@ class ListDestructor : public Foo {
   virtual void Observe(int x) OVERRIDE {
     delete list_;
   }
-  int total;
+
  private:
   ObserverList<Foo>* list_;
 };