Hold cros_component_installers in browser_process.

chrome/browser/component_updater/cros_component_installer.h

Index: chrome/browser/component_updater/cros_component_installer.h
diff --git a/chrome/browser/component_updater/cros_component_installer.h b/chrome/browser/component_updater/cros_component_installer.h
index 7673d744f2d468add48964847aa5d17111e3694d..b36318130a2ed1bf11b72fb1a10625225fe92158 100644
--- a/chrome/browser/component_updater/cros_component_installer.h
+++ b/chrome/browser/component_updater/cros_component_installer.h
@@ -57,6 +57,17 @@ class CrOSComponentInstallerTraits : public ComponentInstallerTraits {
   DISALLOW_COPY_AND_ASSIGN(CrOSComponentInstallerTraits);
 };
 
+class CrOSComponentInstaller
+    : public component_updater::DefaultComponentInstaller {
+ public:
+  CrOSComponentInstaller(
+      std::unique_ptr<ComponentInstallerTraits> installer_traits);
+  std::unique_ptr<base::DictionaryValue> GetCurrentManifest();
+
+ private:
+  ~CrOSComponentInstaller() override;
+};
+
 // This class contains functions used to register and install a component.
 class CrOSComponent {
  public: