Turn on component updater on chromeos, only for the pnacl component.

chrome/test/base/testing_browser_process.cc

Index: chrome/test/base/testing_browser_process.cc
diff --git a/chrome/test/base/testing_browser_process.cc b/chrome/test/base/testing_browser_process.cc
index a14834db61fb9c0bda7e5fd0175ea5f80540aa76..d3d21f09c30e3d25c40cd5d6dc5bc00c7d50d59f 100644
--- a/chrome/test/base/testing_browser_process.cc
+++ b/chrome/test/base/testing_browser_process.cc
@@ -305,6 +305,10 @@ CRLSetFetcher* TestingBrowserProcess::crl_set_fetcher() {
   return NULL;
 }
 
+PnaclComponentInstaller* TestingBrowserProcess::pnacl_component_installer() {
+  return NULL;
+}
+
 BookmarkPromptController* TestingBrowserProcess::bookmark_prompt_controller() {
 #if defined(OS_IOS)
   NOTIMPLEMENTED();