Revert of Refactor webrtc_perf_tests into several source_sets.

webrtc/call/BUILD.gn

Index: webrtc/call/BUILD.gn
diff --git a/webrtc/call/BUILD.gn b/webrtc/call/BUILD.gn
index 195c37f614b8858371e244846767b5b5f7bc73c6..4a3238534838a43df5101c27e5816790570de43c 100644
--- a/webrtc/call/BUILD.gn
+++ b/webrtc/call/BUILD.gn
@@ -75,21 +75,4 @@
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
-
-  rtc_source_set("call_perf_tests") {
-    testonly = true
-    sources = [
-      "call_perf_tests.cc",
-      "rampup_tests.cc",
-      "rampup_tests.h",
-    ]
-    deps = [
-      "//testing/gtest",
-      "//webrtc/test:test_common",
-    ]
-    if (!build_with_chromium && is_clang) {
-      # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
-      suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
-    }
-  }
 }