Fix printing.gyp by joining two 'conditions' dicts together.

Revision b779ce61 broke the
generate_build_files step on the Dr. Memory build:

gyp: Key 'conditions' repeated at level 6 with key path
'targets.0.conditions.5.1' while reading
C:\b\build\slave\drm-cr\build\src\printing\printing.gyp

BUG=607668
TEST=none
TBR=skau@chromium.org

Review-Url: https://codereview.chromium.org/2173063002
Cr-Commit-Position: refs/heads/master@{#407160}

printing/printing.gyp

@@ -167,14 +167,6 @@
                 ],
               },
             }],
-          ],
-          'defines': [
-            # PRINT_BACKEND_AVAILABLE disables the default dummy implementation
-            # of the print backend and enables a custom implementation instead.
-            'PRINT_BACKEND_AVAILABLE',
-          ],
-
-          'conditions': [
             ['chromeos==1', {
               'sources': [
                 'backend/cups_connection.cc',
@@ -196,6 +188,11 @@
               ],
             }],
           ],
+          'defines': [
+            # PRINT_BACKEND_AVAILABLE disables the default dummy implementation
+            # of the print backend and enables a custom implementation instead.
+            'PRINT_BACKEND_AVAILABLE',
+          ],
         }],
         ['OS=="linux" and chromeos==1', {
           'defines': [