Hook up --pack-extension on Linux and FreeBSD.

chrome/browser/browser_init.cc

Index: chrome/browser/browser_init.cc
diff --git a/chrome/browser/browser_init.cc b/chrome/browser/browser_init.cc
index b551bcf7b9eef3390943778bbd7541626c503ee5..b10aed5af5c9cd648545da741f53906fc113a62d 100644
--- a/chrome/browser/browser_init.cc
+++ b/chrome/browser/browser_init.cc
@@ -28,7 +28,7 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_window.h"
 #include "chrome/browser/defaults.h"
-#if defined(OS_WIN)  // TODO(port)
+#if !defined(OS_MACOSX)  // TODO(port)
 #include "chrome/browser/extensions/extension_creator.h"
 #endif
 #include "chrome/browser/extensions/extensions_service.h"
@@ -747,11 +747,9 @@ bool BrowserInit::ProcessCmdLineImpl(const CommandLine& command_line,
             output_private_key_path.ReplaceExtension(FILE_PATH_LITERAL("pem"));
       }
 
-      // TODO(port): Creation & running is removed from mac & linux because
-      // ExtensionCreator depends on base/crypto/rsa_private_key and
-      // base/crypto/signature_creator, both of which only have windows
-      // implementations.
-#if defined(OS_WIN)
+      // TODO(port): Creation & running is removed from Mac because
+      // ExtensionCreator depends on base/crypto/signature_creator
+#if !defined(OS_MACOSX)
       scoped_ptr<ExtensionCreator> creator(new ExtensionCreator());
       if (creator->Run(src_dir, crx_path, private_key_path,
           output_private_key_path)) {
@@ -769,16 +767,24 @@ bool BrowserInit::ProcessCmdLineImpl(const CommandLine& command_line,
           message = StringPrintf(L"Created the extension:\n\n%ls",
                                  crx_path.ToWStringHack().c_str());
         }
+#if defined(OS_WIN)
         win_util::MessageBox(NULL, message, L"Extension Packaging Success",
                              MB_OK | MB_SETFOREGROUND);
+#else
+        fprintf(stderr, "Extension Packaging Success");
+#endif
       } else {
+#if defined(OS_WIN)
         win_util::MessageBox(NULL, UTF8ToWide(creator->error_message()),
             L"Extension Packaging Error", MB_OK | MB_SETFOREGROUND);
+#else
+        fprintf(stderr, "Extension Packaging Error: %s", creator->error_message().c_str());
+#endif
         return false;
       }
 #else
-      NOTIMPLEMENTED() << " extension creation not implemented on POSIX.";
-#endif  // defined(OS_WIN)
+      NOTIMPLEMENTED() << " extension creation not implemented on Mac.";
+#endif  // !defined(OS_MACOSX)
       return false;
     }
   }