Separate sources that depend on printing into a different group.

chrome/chrome_common.gypi

Index: chrome/chrome_common.gypi
diff --git a/chrome/chrome_common.gypi b/chrome/chrome_common.gypi
index 9b5c97c740b9141003a7cff605923d9291556911..dd9e0669d2704b79ad867c9d74ea7c7da3905617 100644
--- a/chrome/chrome_common.gypi
+++ b/chrome/chrome_common.gypi
@@ -27,17 +27,6 @@
       'common/chrome_content_client_ios.mm',
       'common/chrome_result_codes.h',
       'common/chrome_utility_messages.h',
-      'common/chrome_utility_printing_messages.h',
-      'common/cloud_print/cloud_print_cdd_conversion.cc',
-      'common/cloud_print/cloud_print_cdd_conversion.h',
-      'common/cloud_print/cloud_print_class_mac.h',
-      'common/cloud_print/cloud_print_class_mac.mm',
-      'common/cloud_print/cloud_print_constants.cc',
-      'common/cloud_print/cloud_print_constants.h',
-      'common/cloud_print/cloud_print_helpers.cc',
-      'common/cloud_print/cloud_print_helpers.h',
-      'common/cloud_print/cloud_print_proxy_info.cc',
-      'common/cloud_print/cloud_print_proxy_info.h',
       'common/common_message_generator.cc',
       'common/common_message_generator.h',
       'common/common_param_traits.cc',
@@ -200,6 +189,19 @@
       'common/extensions/sync_helper.cc',
       'common/extensions/sync_helper.h',
     ],
+    'chrome_common_printing_sources': [
+      'common/chrome_utility_printing_messages.h',
+      'common/cloud_print/cloud_print_cdd_conversion.cc',
+      'common/cloud_print/cloud_print_cdd_conversion.h',
+      'common/cloud_print/cloud_print_class_mac.h',
+      'common/cloud_print/cloud_print_class_mac.mm',
+      'common/cloud_print/cloud_print_constants.cc',
+      'common/cloud_print/cloud_print_constants.h',
+      'common/cloud_print/cloud_print_helpers.cc',
+      'common/cloud_print/cloud_print_helpers.h',
+      'common/cloud_print/cloud_print_proxy_info.cc',
+      'common/cloud_print/cloud_print_proxy_info.h',
+    ],
     'chrome_common_extensions_chromeos_sources': [
       'common/extensions/api/file_browser_handlers/file_browser_handler.cc',
       'common/extensions/api/file_browser_handlers/file_browser_handler.h',
@@ -460,6 +462,8 @@
           ],
         }],
         ['enable_basic_printing==1 or enable_print_preview==1', {
+          'sources': [ '<@(chrome_common_printing_sources)' ],
+
           'dependencies': [
             '<(DEPTH)/components/components.gyp:printing_common',
             '<(DEPTH)/printing/printing.gyp:printing',