Make ComponentInstaller refcounted.

components/update_client/component_patcher.h

Index: components/update_client/component_patcher.h
diff --git a/components/update_client/component_patcher.h b/components/update_client/component_patcher.h
index b7dd216df4a90386441a75bb390f940d09a1fe8b..394edfef8c2c6ed0f6487a613a2e3c50f1e355dd 100644
--- a/components/update_client/component_patcher.h
+++ b/components/update_client/component_patcher.h
@@ -61,7 +61,7 @@ class ComponentPatcher : public base::RefCountedThreadSafe<ComponentPatcher> {
   // out-of-process.
   ComponentPatcher(const base::FilePath& input_dir,
                    const base::FilePath& unpack_dir,
-                   ComponentInstaller* installer,
+                   scoped_refptr<ComponentInstaller> installer,
                    scoped_refptr<OutOfProcessPatcher> out_of_process_patcher,
                    scoped_refptr<base::SequencedTaskRunner> task_runner);
 
@@ -86,7 +86,7 @@ class ComponentPatcher : public base::RefCountedThreadSafe<ComponentPatcher> {
 
   const base::FilePath input_dir_;
   const base::FilePath unpack_dir_;
-  ComponentInstaller* const installer_;
+  scoped_refptr<ComponentInstaller> installer_;
   scoped_refptr<OutOfProcessPatcher> out_of_process_patcher_;
   ComponentUnpacker::Callback callback_;
   scoped_ptr<base::ListValue> commands_;