Do not compress chrome.7z into chrome.packed.7z for developer (component) builds.

chrome/installer/mini_installer.gyp

 {
   'variables': {
     'version_py': '../../chrome/tools/build/version.py',
     'version_path': '../../chrome/VERSION',
     'lastchange_path': '<(DEPTH)/build/util/LASTCHANGE',
     # 'branding_dir' is set in the 'conditions' section at the bottom.
     'msvs_use_common_release': 0,
     'msvs_use_common_linker_extras': 0,
     'mini_installer_internal_deps%': 0,
     'mini_installer_official_deps%': 0,
@@ skipping 205 matching lines @@
                   },
                 }],
                 ['component == "shared_library"', {
                   'variables': {
                     'component_build_flag': '--component_build=1',
                   },
                 }, {
                   'variables': {
                     'component_build_flag': '',
                   },
+                  'outputs': [
+                    '<(PRODUCT_DIR)/<(RULE_INPUT_NAME).packed.7z',
+                  ],
                 }],
                 ['disable_nacl==1', {
                   'inputs!': [
                     '<(PRODUCT_DIR)/nacl64.exe',
                     '<(PRODUCT_DIR)/ppGoogleNaClPluginChrome.dll',
                     '<(PRODUCT_DIR)/nacl_irt_x86_32.nexe',
                     '<(PRODUCT_DIR)/nacl_irt_x86_64.nexe',
                   ],
                 }],
               ],
               'inputs': [
                 '<(create_installer_archive_py_path)',
                 '<(PRODUCT_DIR)/app_host.exe',
                 '<(PRODUCT_DIR)/chrome.exe',
                 '<(PRODUCT_DIR)/chrome.dll',
                 '<(PRODUCT_DIR)/nacl64.exe',
                 '<(PRODUCT_DIR)/ppGoogleNaClPluginChrome.dll',
                 '<(PRODUCT_DIR)/nacl_irt_x86_32.nexe',
                 '<(PRODUCT_DIR)/nacl_irt_x86_64.nexe',
                 '<(PRODUCT_DIR)/locales/en-US.pak',
                 '<(PRODUCT_DIR)/icudt.dll',
               ],
               'outputs': [
+                # Also note that chrome.packed.7z is defined as an output in a
+                # conditional above.
                 'xxx2.out',
                 '<(PRODUCT_DIR)/<(RULE_INPUT_NAME).7z',
-                '<(PRODUCT_DIR)/<(RULE_INPUT_NAME).packed.7z',
                 '<(PRODUCT_DIR)/setup.ex_',
                 '<(INTERMEDIATE_DIR)/packed_files.rc',
               ],
               'action': [
                 'python',
                 '<(create_installer_archive_py_path)',
                 '--build_dir', '<(PRODUCT_DIR)',
                 '--staging_dir', '<(INTERMEDIATE_DIR)',
                 '--input_file', '<(RULE_INPUT_PATH)',
                 '--resource_file_path', '<(INTERMEDIATE_DIR)/packed_files.rc',
@@ skipping 25 matching lines @@
       'variables': {
          'branding_dir': '../app/theme/google_chrome',
       },
     }, { # else branding!="Chrome"
       'variables': {
          'branding_dir': '../app/theme/chromium',
       },
     }],
   ],
 }