Reland: Enable user-initiated cleanups by default

Bug: 800507
Change-Id: I6c519b8e83a8875eba17e80559e31817498ecd16
Reviewed-on: https://chromium-review.googlesource.com/982094
Commit-Queue: Fabio Tirelo <ftirelo@chromium.org>
Commit-Queue: Chris Sharp <csharp@chromium.org>
Reviewed-by: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546125}

chrome/browser/safe_browsing/chrome_cleaner/srt_field_trial_win.cc

@@ -39,7 +39,7 @@ const base::Feature kRebootPromptDialogFeature{
     "RebootPromptDialog", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kUserInitiatedChromeCleanupsFeature{
-    "UserInitiatedChromeCleanups", base::FEATURE_DISABLED_BY_DEFAULT};
+    "UserInitiatedChromeCleanups", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kChromeCleanupDistributionFeature{
     "ChromeCleanupDistribution", base::FEATURE_DISABLED_BY_DEFAULT};