Ensure WEBRTC_MODULE_UTILITY_VIDEO is undefined for enable_video==0.

Move the logic to common.gypi to reduce the chance of the define being
unprotected in the future.

BUG=b/12018143
TESTED=git try, and local Linux build with -Denable_video=0
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/5309004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5244 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/build/common.gypi

@@ -161,6 +161,9 @@
           'WEBRTC_MOZILLA_BUILD',
          ],
       }],
+      ['enable_video==1', {
+        'defines': ['WEBRTC_MODULE_UTILITY_VIDEO',],
+      }],
       ['build_with_chromium==1', {
         'defines': [
           # Changes settings for Chromium build.

webrtc/modules/media_file/source/media_file.gypi

@@ -14,9 +14,6 @@
       'dependencies': [
         '<(webrtc_root)/system_wrappers/source/system_wrappers.gyp:system_wrappers',
       ],
-      'defines': [
-        'WEBRTC_MODULE_UTILITY_VIDEO', # for compiling support for video recording
-      ],
       'include_dirs': [
         '../interface',
         '../../interface',
@@ -26,9 +23,6 @@
           '../interface',
           '../../interface',
         ],
-        'defines': [
-          'WEBRTC_MODULE_UTILITY_VIDEO',
-        ],
       },
       'sources': [
         '../interface/media_file.h',

webrtc/modules/utility/source/utility.gypi

@@ -39,10 +39,6 @@
       ],
       'conditions': [
         ['enable_video==1', {
-          # Adds support for video recording.
-          'defines': [
-            'WEBRTC_MODULE_UTILITY_VIDEO',
-          ],
           'dependencies': [
             'webrtc_video_coding',
           ],