Removing trace checks in VoETestManager.

Trace checks in the ctor and dtor of VoETestManager are removed, since they can fail if there are more than one VoETestManager (or VoE) used in a test.

BUG=

Review URL: https://codereview.webrtc.org/1407883007

Cr-Commit-Position: refs/heads/master@{#10507}
diff --git a/webrtc/voice_engine/test/auto_test/voe_standard_test.cc b/webrtc/voice_engine/test/auto_test/voe_standard_test.cc
index 22eee15..a187c4b 100644
--- a/webrtc/voice_engine/test/auto_test/voe_standard_test.cc
+++ b/webrtc/voice_engine/test/auto_test/voe_standard_test.cc
@@ -117,14 +117,6 @@
   if (initialized_)
     return true;
 
-  if (VoiceEngine::SetTraceFile(NULL) != -1) {
-    // should not be possible to call a Trace method before the VoE is
-    // created
-    TEST_LOG("\nError at line: %i (VoiceEngine::SetTraceFile()"
-      "should fail)!\n", __LINE__);
-    return false;
-  }
-
   voice_engine_ = VoiceEngine::Create();
   if (!voice_engine_) {
     TEST_LOG("Failed to create VoiceEngine\n");
@@ -230,11 +222,6 @@
     releaseOK = false;
   }
 
-  if (VoiceEngine::SetTraceFile(NULL) != -1) {
-    TEST_LOG("\nError at line: %i (VoiceEngine::SetTraceFile()"
-      "should fail)!\n", __LINE__);
-  }
-
   return (releaseOK == true) ? 0 : -1;
 }