Printing: Don't build service code when full printing is not enabled.

chrome/chrome_common.gypi

Index: chrome/chrome_common.gypi
diff --git a/chrome/chrome_common.gypi b/chrome/chrome_common.gypi
index 22a9ef69dfa32af2728742faffd4a9355a971a26..136f5efd8fba21f30ce55576ea83d46cf2cd05c0 100644
--- a/chrome/chrome_common.gypi
+++ b/chrome/chrome_common.gypi
@@ -390,7 +390,6 @@
             ['exclude', '^common/nacl_'],
             ['exclude', '^common/pepper_flash\\.'],
             ['exclude', '^common/profiling\\.'],
-            ['exclude', '^common/service_process_util_'],
             ['exclude', '^common/spellcheck_'],
             ['exclude', '^common/validation_message_'],
             ['exclude', '^common/web_apps\\.'],
@@ -408,11 +407,24 @@
             '<(DEPTH)/breakpad/src',
           ],
         }],
-        ['enable_printing!=0', {
+        ['enable_printing==0', {
+          'sources!': [
+            'common/print_messages.cc',
+            'common/print_messages.h',
+          ]
+        }, {
           'dependencies': [
             '<(DEPTH)/printing/printing.gyp:printing',
           ],
         }],
+        ['enable_printing!=1', {
+          'sources!' : [
+            'common/service_messages.h',
+          ],
+          'sources/': [
+            ['exclude', '^common/service_process_util_'],
+          ],
+        }],
         ['enable_service_discovery==1', {
           'sources' : [
             'common/local_discovery/service_discovery_client.cc',
@@ -490,12 +502,6 @@
             'common/media/webrtc_logging_messages.h',
           ]
         }],
-        ['enable_printing==0', {
-          'sources!': [
-            'common/print_messages.cc',
-            'common/print_messages.h',
-          ]
-        }],
         ['configuration_policy==1', {
           'dependencies': [
             '<(DEPTH)/components/components.gyp:policy',