Revert "Re-enable the RightClickMenuShowsCopyUrl test on mac."

This reverts commit 21497283.

Reason for revert: It seems the timeouts are still happening, see the builder page here: https://ci.chromium.org/p/chromium/builders/ci/Mac10.11%20Tests

Original change's description:
> Re-enable the RightClickMenuShowsCopyUrl test on mac.
> 
> Test timeout on CQ seems to have mysteriously fixed itself.
> 
> Bug:988323
> Fixed:988323
> 
> Change-Id: Ia96d8a687bc161cf74f67fbf819ffaf7bb896755
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2325330
> Auto-Submit: Glen Robertson <glenrob@chromium.org>
> Commit-Queue: Evan Stade <estade@chromium.org>
> Reviewed-by: Evan Stade <estade@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#792705}

TBR=estade@chromium.org,glenrob@chromium.org

Change-Id: I5de2c6b986703f81b43977072951f1923ce3bb8f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 988323
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2326733Reviewed-by: Guillaume Jenkins <gujen@google.com>
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Cr-Commit-Position: refs/heads/master@{#792762}

chrome/browser/ui/views/location_bar/custom_tab_bar_view_browsertest.cc

@@ -422,8 +422,14 @@ IN_PROC_BROWSER_TEST_P(CustomTabBarViewBrowserTest,
 }
 
 // Right-click menu on CustomTabBar should have Copy URL option.
+// TODO(crbug.com/988323): Times out on Mac.
+#if defined(OS_MACOSX)
+#define MAYBE_RightClickMenuShowsCopyUrl DISABLED_RightClickMenuShowsCopyUrl
+#else
+#define MAYBE_RightClickMenuShowsCopyUrl RightClickMenuShowsCopyUrl
+#endif
 IN_PROC_BROWSER_TEST_P(CustomTabBarViewBrowserTest,
-                       RightClickMenuShowsCopyUrl) {
+                       MAYBE_RightClickMenuShowsCopyUrl) {
   const GURL& app_url = https_server()->GetURL("app.com", "/ssl/google.html");
   InstallPWA(app_url);
   EXPECT_TRUE(app_browser_->is_type_app());