Hold cros_component_installers in browser_process.

chrome/browser/component_updater/cros_component_installer.cc

Index: chrome/browser/component_updater/cros_component_installer.cc
diff --git a/chrome/browser/component_updater/cros_component_installer.cc b/chrome/browser/component_updater/cros_component_installer.cc
index b68cd03f14e51a67945e8b6a09eaa450bfb6cfc5..e21d3d127cb5edb3c8b18688fac111c2f3cdd029 100644
--- a/chrome/browser/component_updater/cros_component_installer.cc
+++ b/chrome/browser/component_updater/cros_component_installer.cc
@@ -128,6 +128,7 @@ std::vector<std::string> CrOSComponentInstallerTraits::GetMimeTypes() const {
 }
 
 void CrOSComponent::RegisterCrOSComponentInternal(
+    const std::string& name,
     ComponentUpdateService* cus,
     const ComponentConfig& config,
     const base::Closure& installcallback) {
@@ -135,8 +136,9 @@ void CrOSComponent::RegisterCrOSComponentInternal(
       new CrOSComponentInstallerTraits(config));
   // |cus| will take ownership of |installer| during

[sky, 2017/05/23 23:20:30]

Update comment?

Also, I'm rather confused about the ownership model. I don't see any other
changes to CrOSComponentInstallerTraits, so how is it that the installer created
by GetCrosComponentInstaller() isn't destroyed like this comment implies it was?

[xiaochu, 2017/05/23 23:40:52]

Done.

   // installer->Register(cus).
-  DefaultComponentInstaller* installer =
-      new DefaultComponentInstaller(std::move(traits));
+  scoped_refptr<DefaultComponentInstaller> installer =
+      g_browser_process->platform_part()->GetCrosComponentInstaller(
+          name, std::move(traits));
   installer->Register(cus, installcallback);
 }
 
@@ -174,7 +176,7 @@ bool CrOSComponent::InstallCrOSComponent(
   ComponentConfig config(it->first, it->second.find("env_version")->second,
                          it->second.find("sha2hashstr")->second);
   RegisterCrOSComponentInternal(
-      cus, config,
+      name, cus, config,
       base::Bind(InstallChromeOSComponent, cus,
                  crx_file::id_util::GenerateIdFromHex(
                      it->second.find("sha2hashstr")->second)