Re-enable PageDiscardingHelperBrowserTest.DiscardSpecificPage.

The test was disabled due to flakiness, but the CL that caused the
flakiness has been reverted, so the test can be re-enabled (see bug).

Bug: 348648417
Change-Id: I83a641e74b43776b927bc0986b8387f7f7b425da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5926055
Reviewed-by: Joe Mason <joenotcharles@google.com>
Commit-Queue: Francois Pierre Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1371385}
diff --git a/chrome/browser/performance_manager/policies/page_discarding_helper_browsertest.cc b/chrome/browser/performance_manager/policies/page_discarding_helper_browsertest.cc
index 9309b7c..d19c2dc 100644
--- a/chrome/browser/performance_manager/policies/page_discarding_helper_browsertest.cc
+++ b/chrome/browser/performance_manager/policies/page_discarding_helper_browsertest.cc
@@ -160,8 +160,7 @@
   }
 };
 
-IN_PROC_BROWSER_TEST_F(PageDiscardingHelperBrowserTest,
-                       DISABLED_DiscardSpecificPage) {
+IN_PROC_BROWSER_TEST_F(PageDiscardingHelperBrowserTest, DiscardSpecificPage) {
   // Test urgent and proactive discards in a loop to avoid the overhead of
   // starting a new browser every time.
   // TODO(crbug.com/40899366): Add tests for all the other heuristics in