Cleanup temporary files created by tests.

webrtc/base/optionsfile_unittest.cc

Index: webrtc/base/optionsfile_unittest.cc
diff --git a/webrtc/base/optionsfile_unittest.cc b/webrtc/base/optionsfile_unittest.cc
index adddb95215fd979c3043b919b256c45781fdfc0e..bcfb3efcf6fa37795d18bdf1a7efaf08f176df79 100644
--- a/webrtc/base/optionsfile_unittest.cc
+++ b/webrtc/base/optionsfile_unittest.cc
@@ -42,6 +42,10 @@ class OptionsFileTest : public testing::Test {
     OpenStore();
   }
 
+  ~OptionsFileTest() override {
+    remove(test_file_.c_str());
+  }
+
  protected:
   void OpenStore() {
     store_.reset(new OptionsFile(test_file_));