Fix create_installer_archive.py to be more flexible with output directory names

chrome/installer/mini_installer.gypi

Index: chrome/installer/mini_installer.gypi
diff --git a/chrome/installer/mini_installer.gypi b/chrome/installer/mini_installer.gypi
index a994740797fa6fa7590f5b00a4654b479026b6f2..c3c12a2cb87f4aae907158115fcc30f233758b8e 100644
--- a/chrome/installer/mini_installer.gypi
+++ b/chrome/installer/mini_installer.gypi
@@ -181,6 +181,13 @@
             '<(PRODUCT_DIR)/nacl64.exe',
             '<(PRODUCT_DIR)/nacl_irt_x86_32.nexe',
           ],
+          'variables': {
+            'target_arch_flag': '--target_arch=x64',
+          },
+        }, {
+          'variables': {
+            'target_arch_flag': '--target_arch=x86',
+          },
         }],
       ],
       'inputs': [
@@ -212,6 +219,7 @@
         '--resource_file_path=<(INTERMEDIATE_DIR)/packed_files.rc',
         '<(enable_hidpi_flag)',
         '<(enable_touch_ui_flag)',
+        '<(target_arch_flag)',
         # TODO(sgk):  may just use environment variables
         #'--distribution=$(CHROMIUM_BUILD)',
         '--distribution=_google_chrome',