Use ContainsValue() instead of std::find() in chromecast/

chromecast/base/observer.h

Index: chromecast/base/observer.h
diff --git a/chromecast/base/observer.h b/chromecast/base/observer.h
index a1b6d48f39ac36e6c196086c67a78489f954ccf7..8aa5af3d86f328b7071131b85a53d64c9fee2f48 100644
--- a/chromecast/base/observer.h
+++ b/chromecast/base/observer.h
@@ -114,6 +114,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/sequence_checker.h"
 #include "base/sequenced_task_runner.h"
+#include "base/stl_util.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/sequenced_task_runner_handle.h"
 
@@ -266,16 +267,14 @@ class ObservableInternals
     void AddObserver(Observer<T>* observer) {
       DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
       DCHECK(observer);
-      DCHECK(std::find(observers_.begin(), observers_.end(), observer) ==
-             observers_.end());
+      DCHECK(!base::ContainsValue(observers_, observer));
       observers_.push_back(observer);
     }
 
     void RemoveObserver(Observer<T>* observer) {
       DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
       DCHECK(observer);
-      DCHECK(std::find(observers_.begin(), observers_.end(), observer) !=
-             observers_.end());
+      DCHECK(base::ContainsValue(observers_, observer));
       observers_.erase(
           std::remove(observers_.begin(), observers_.end(), observer),
           observers_.end());