Disable all protobuf dependent targets when enable_protobuf=0.

BUG=3045
TESTED=builds now when enable_protobuf=0 and modules_unittests still
includes ApmTest.* when enable_protobuf=1.

R=bjornv@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/9879004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5690 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/modules.gyp b/webrtc/modules/modules.gyp
index 5d0827c..096c04e 100644
--- a/webrtc/modules/modules.gyp
+++ b/webrtc/modules/modules.gyp
@@ -71,7 +71,6 @@
           'dependencies': [
             'audio_coding_module',
             'audio_processing',
-            'audioproc_unittest_proto',
             'bitrate_controller',
             'CNG',
             'desktop_capture',
@@ -155,10 +154,7 @@
             'audio_coding/neteq4/mock/mock_payload_splitter.h',
             'audio_processing/aec/system_delay_unittest.cc',
             'audio_processing/aec/echo_cancellation_unittest.cc',
-            'audio_processing/audio_processing_impl_unittest.cc',
             'audio_processing/echo_cancellation_impl_unittest.cc',
-            'audio_processing/test/audio_processing_unittest.cc',
-            'audio_processing/test/test_utils.h',
             'audio_processing/utility/delay_estimator_unittest.cc',
             'audio_processing/utility/ring_buffer_unittest.cc',
             'bitrate_controller/bitrate_controller_unittest.cc',
@@ -285,6 +281,14 @@
             }],
             ['enable_protobuf==1', {
               'defines': [ 'WEBRTC_AUDIOPROC_DEBUG_DUMP' ],
+              'dependencies': [
+                'audioproc_unittest_proto',
+              ],
+              'sources': [
+                'audio_processing/audio_processing_impl_unittest.cc',
+                'audio_processing/test/audio_processing_unittest.cc',
+                'audio_processing/test/test_utils.h',
+              ],
             }],
             ['build_libvpx==1', {
               'dependencies': [