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 77d8d385dd306afe6666de523c1e9fe6f2b0f3a1..9cc907eb2dc7ab4c7f33caf8616fa7bf0aa12dbc 100644
--- a/chrome/common/chrome_paths.cc
+++ b/chrome/common/chrome_paths.cc
@@ -242,6 +242,11 @@ bool PathProvider(int key, FilePath* result) {
         return false;
       cur = cur.Append(kInternalNaClPluginFileName);
       break;
+      // TODO(jvoung): Do we want a default value or just the ability to
+      // override immediately when testing on bots to avoid race conditions?
+    case chrome::FILE_PNACL_COMPONENT:
+        return false;
+      break;
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
     case chrome::FILE_NACL_HELPER:
       if (!PathService::Get(base::DIR_MODULE, &cur))