Fix Visual Studio 2015 WebRtc x86 build.

webrtc/modules/audio_processing/audio_processing_impl_locking_unittest.cc

Index: webrtc/modules/audio_processing/audio_processing_impl_locking_unittest.cc
diff --git a/webrtc/modules/audio_processing/audio_processing_impl_locking_unittest.cc b/webrtc/modules/audio_processing/audio_processing_impl_locking_unittest.cc
index 3d2c71fb2dbef38993eef42054aa2b27db9e6f23..2e22b2c51ebfc773c30b0272e20f92edc517f86f 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl_locking_unittest.cc
+++ b/webrtc/modules/audio_processing/audio_processing_impl_locking_unittest.cc
@@ -198,8 +198,12 @@ struct TestConfig {
           AecType::BasicWebRtcAecSettingsWithDelayAgnosticAec,
           AecType::BasicWebRtcAecSettingsWithAecMobile};
       for (auto test_config : in) {
-        for (auto aec_type : aec_types) {
-          test_config.aec_type = aec_type;
+        // Due to a VisualStudio 2015 compiler issue, the internal loop
+        // variable here cannot override a previously defined name.
+        // In other words "type" cannot be named "aec_type" here.
+        // https://connect.microsoft.com/VisualStudio/feedback/details/2291755
+        for (auto type : aec_types) {
+          test_config.aec_type = type;
           out.push_back(test_config);
         }
       }