[Extensions] Re-enable a test that's no longer broken on Mac.

The WindowOpenApiTest.WindowOpenSized was disabled on Mac but
it is no longer broken.

Note: This test was NOT disabled because it was flaky.

Bug: 225601
Change-Id: I6d6193f7fa745f6189887e849d596855a0fc5b91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252928Reviewed-by: Archana Simha <archanasimha@chromium.org>
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780515}

chrome/browser/extensions/window_open_apitest.cc

@@ -221,15 +221,9 @@ IN_PROC_BROWSER_TEST_F(WindowOpenApiTest, WindowOpener) {
   ASSERT_TRUE(RunExtensionTest("window_open/opener")) << message_;
 }
 
-#if defined(OS_MACOSX)
-// Extension popup windows are incorrectly sized on OSX, crbug.com/225601
-#define MAYBE_WindowOpenSized DISABLED_WindowOpenSized
-#else
-#define MAYBE_WindowOpenSized WindowOpenSized
-#endif
 // Ensure that the width and height properties of a window opened with
 // chrome.windows.create match the creation parameters. See crbug.com/173831.
-IN_PROC_BROWSER_TEST_F(WindowOpenApiTest, MAYBE_WindowOpenSized) {
+IN_PROC_BROWSER_TEST_F(WindowOpenApiTest, WindowOpenSized) {
   ASSERT_TRUE(RunExtensionTest("window_open/window_size")) << message_;
   EXPECT_TRUE(WaitForTabsPopupsApps(browser(), 0, 0, 1));
 }