Make setup.exe compatible with the component build.

chrome/installer/mini_installer.gyp

Index: chrome/installer/mini_installer.gyp
diff --git a/chrome/installer/mini_installer.gyp b/chrome/installer/mini_installer.gyp
index 70a607ebe39fed4af5e796ff9f71fe0daef641df..e0980db6a46c341a97cc3fb89d66dbc063f6e582 100644
--- a/chrome/installer/mini_installer.gyp
+++ b/chrome/installer/mini_installer.gyp
@@ -213,6 +213,15 @@
                     'enable_metro_flag': '',
                   },
                 }],
+                ['component == "shared_library"', {
+                  'variables': {
+                    'component_build_flag': '--component_build=1',
+                  },
+                }, {
+                  'variables': {
+                    'component_build_flag': '',
+                  },
+                }],
               ],
               'inputs': [
                 '<(create_installer_archive_py_path)',
@@ -241,6 +250,7 @@
                 '--resource_file_path', '<(INTERMEDIATE_DIR)/packed_files.rc',
                 '<(enable_hidpi_flag)',
                 '<(enable_metro_flag)',
+                '<(component_build_flag)',
                 # TODO(sgk):  may just use environment variables
                 #'--distribution=$(CHROMIUM_BUILD)',
                 '--distribution=_google_chrome',