Add a component installer for Portable NaCl. Registration of installer is

chrome/common/chrome_paths.cc

Index: chrome/common/chrome_paths.cc
diff --git a/chrome/common/chrome_paths.cc b/chrome/common/chrome_paths.cc
index e2f10194862dd510bed9749ad0d3c33f23ab9eb2..6232b8596984549d6c67dd5fa44d3b02298c6885 100644
--- a/chrome/common/chrome_paths.cc
+++ b/chrome/common/chrome_paths.cc
@@ -252,6 +252,10 @@ bool PathProvider(int key, FilePath* result) {
         return false;
       cur = cur.Append(kInternalNaClPluginFileName);
       break;
+    case chrome::FILE_PNACL_COMPONENT:
+      // TODO(jvoung): Do we want a default value or just the ability to
+      // override immediately when testing on bots to avoid race conditions?
+      return false;
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
     case chrome::FILE_NACL_HELPER:
       if (!PathService::Get(base::DIR_MODULE, &cur))