app_list: Enable level 1 of cpplint, be stricker.

ui/app_list/views/contents_animator.h

Index: ui/app_list/views/contents_animator.h
diff --git a/ui/app_list/views/contents_animator.h b/ui/app_list/views/contents_animator.h
index 8c85c3e51900be08981f7068606ae9fdb0a28847..2bc7daad764621edb54e2458d2531c50798090cd 100644
--- a/ui/app_list/views/contents_animator.h
+++ b/ui/app_list/views/contents_animator.h
@@ -80,6 +80,7 @@ class DefaultAnimator : public ContentsAnimator {
   std::string NameForTests() const override;
   void Update(double progress, int from_page, int to_page) override;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(DefaultAnimator);
 };
 
@@ -94,6 +95,7 @@ class StartToAppsAnimator : public ContentsAnimator {
   std::string NameForTests() const override;
   void Update(double progress, int start_page, int apps_page) override;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(StartToAppsAnimator);
 };
 
@@ -105,6 +107,7 @@ class StartToCustomAnimator : public ContentsAnimator {
   std::string NameForTests() const override;
   void Update(double progress, int start_page, int custom_page) override;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(StartToCustomAnimator);
 };