Add nacl_modules key to extension manifests

chrome/common/extensions/extension_constants.h

Index: chrome/common/extensions/extension_constants.h
===================================================================
--- chrome/common/extensions/extension_constants.h	(revision 80873)
+++ chrome/common/extensions/extension_constants.h	(working copy)
@@ -38,6 +38,9 @@
   extern const char* kLaunchWidth;
   extern const char* kMatches;
   extern const char* kMinimumChromeVersion;
+  extern const char* kNaClModules;
+  extern const char* kNaClModulesMIMEType;
+  extern const char* kNaClModulesPath;
   extern const char* kName;
   extern const char* kOmnibox;
   extern const char* kOmniboxKeyword;
@@ -148,6 +151,9 @@
   extern const char* kInvalidMatchCount;
   extern const char* kInvalidMatches;
   extern const char* kInvalidMinimumChromeVersion;
+  extern const char* kInvalidNaClModules;
+  extern const char* kInvalidNaClModulesMIMEType;
+  extern const char* kInvalidNaClModulesPath;
   extern const char* kInvalidName;
   extern const char* kInvalidOmniboxKeyword;
   extern const char* kInvalidOptionsPage;