[Headless] Removed leftover ifdefs from BrowserSetProxyConfig test.

These ifdefs were there since the test was part of Compositor fixture,
which is not the case anymore, hence no need to limit testing on
platforms that don't support BeginFrame  control.

Change-Id: I331e656ea64e7f2941a2eb3b7584b98caf21ceff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511855Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Peter Kvitek <kvitekp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822918}

headless/test/headless_protocol_browsertest.cc

@@ -294,28 +294,12 @@ class HeadlessProtocolBrowserTestWithProxy
   net::EmbeddedTestServer proxy_server_;
 };
 
-// BeginFrameControl is not supported on MacOS yet, see: https://cs.chromium.org
-// chromium/src/headless/lib/browser/protocol/target_handler.cc?
-// rcl=5811aa08e60ba5ac7622f029163213cfbdb682f7&l=32
-// TODO(crbug.com/954398): Suite is timeout-flaky on Windows.
-// TODO(crbug.com/1020046): Suite is flaky on TSan Linux.
-#if defined(OS_MAC) || defined(NO_WIN_FLAKES) || \
-    ((defined(OS_LINUX) || defined(OS_CHROMEOS)) && defined(THREAD_SANITIZER))
-#define HEADLESS_PROTOCOL_TEST_WITH_PROXY(TEST_NAME, SCRIPT_NAME) \
-  IN_PROC_BROWSER_TEST_F(HeadlessProtocolBrowserTestWithProxy,    \
-                         DISABLED_##TEST_NAME) {                  \
-    test_folder_ = "/protocol/";                                  \
-    script_name_ = SCRIPT_NAME;                                   \
-    RunTest();                                                    \
-  }
-#else
 #define HEADLESS_PROTOCOL_TEST_WITH_PROXY(TEST_NAME, SCRIPT_NAME)           \
   IN_PROC_BROWSER_TEST_F(HeadlessProtocolBrowserTestWithProxy, TEST_NAME) { \
     test_folder_ = "/protocol/";                                            \
     script_name_ = SCRIPT_NAME;                                             \
     RunTest();                                                              \
   }
-#endif
 
 HEADLESS_PROTOCOL_TEST_WITH_PROXY(BrowserSetProxyConfig,
                                   "sanity/browser-set-proxy-config.js")