Change name of files and class in agc/histogram* in order to avoid file-name clash.

webrtc/modules/modules.gyp

 # Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'includes': [
@@ skipping 218 matching lines @@
             'audio_coding/neteq/mock/mock_payload_splitter.h',
             'audio_coding/neteq/tools/input_audio_file_unittest.cc',
             'audio_coding/neteq/tools/packet_unittest.cc',
             'audio_conference_mixer/test/audio_conference_mixer_unittest.cc',
             'audio_device/fine_audio_buffer_unittest.cc',
             'audio_processing/aec/echo_cancellation_unittest.cc',
             'audio_processing/aec/system_delay_unittest.cc',
             'audio_processing/agc/agc_manager_direct_unittest.cc',
             # TODO(ajm): Fix to match new interface.
             # 'audio_processing/agc/agc_unittest.cc',
-            'audio_processing/agc/histogram_unittest.cc',
+            'audio_processing/agc/loudness_histogram_unittest.cc',
             'audio_processing/agc/mock_agc.h',
             'audio_processing/beamformer/array_util_unittest.cc',
             'audio_processing/beamformer/complex_matrix_unittest.cc',
             'audio_processing/beamformer/covariance_matrix_generator_unittest.cc',
             'audio_processing/beamformer/matrix_unittest.cc',
             'audio_processing/beamformer/mock_nonlinear_beamformer.h',
             'audio_processing/beamformer/nonlinear_beamformer_unittest.cc',
             'audio_processing/echo_cancellation_impl_unittest.cc',
             'audio_processing/intelligibility/intelligibility_enhancer_unittest.cc',
             'audio_processing/intelligibility/intelligibility_utils_unittest.cc',
@@ skipping 524 matching lines @@
               'sources': [
                 'modules_unittests.isolate',
               ],
             },
           ],
         }],
       ],
     }], # include_tests
   ], # conditions
 }