[SRO] Enabling SRO Incognito by default

Launch on ToT was requested based on
go/clank-sro-incognito-metrics

Bug: 894211
Change-Id: Ib333df7ab99104b8ed9325b3bcb433c27c753b08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510355Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Filip Gorski <fgorski@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823615}

components/omnibox/common/omnibox_features.cc

@@ -296,7 +296,7 @@ const base::Feature kRichAutocompletion{"OmniboxRichAutocompletion",
 
 // Feature that enables Search Ready Omnibox in incognito.
 const base::Feature kOmniboxSearchReadyIncognito{
-    "OmniboxSearchReadyIncognito", base::FEATURE_DISABLED_BY_DEFAULT};
+    "OmniboxSearchReadyIncognito", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Feature that puts a single row of buttons on suggestions with actionable
 // elements like keywords, tab-switch buttons, and Pedals.