Make ComponentInstaller refcounted.

components/update_client/test/test_installer.cc

Index: components/update_client/test/test_installer.cc
diff --git a/components/update_client/test/test_installer.cc b/components/update_client/test/test_installer.cc
index b6a3f8432e3627cada0d439bee14ecd904696440..de32b1fbd42168aaa538a53f02380923210335bd 100644
--- a/components/update_client/test/test_installer.cc
+++ b/components/update_client/test/test_installer.cc
@@ -30,12 +30,7 @@ bool TestInstaller::GetInstalledFile(const std::string& file,
   return false;
 }
 
-int TestInstaller::error() const {
-  return error_;
-}
-
-int TestInstaller::install_count() const {
-  return install_count_;
+TestInstaller::~TestInstaller() {
 }
 
 ReadOnlyTestInstaller::ReadOnlyTestInstaller(const base::FilePath& install_dir)