[omnibox] Enable grouping by search vs. URL by default on iOS.

This is in preparation for launch to all channels.

Bug: 966462
Change-Id: I876ba5b90a06446e81d8bf36c3b17af9e9c5e289
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913971Reviewed-by: Robbie Gibson <rkgibson@google.com>
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715270}

components/omnibox/common/omnibox_features.cc

@@ -59,13 +59,7 @@ const base::Feature kSimplifyHttpsIndicator{"SimplifyHttpsIndicator",
 // by major type. i.e. search types are first, followed by all others,
 // except for the default match which is unchanged in position.
 const base::Feature kOmniboxGroupSuggestionsBySearchVsUrl{
-  "OmniboxGroupSuggestionsBySearchVsUrl",
-#if defined(OS_IOS)
-      base::FEATURE_DISABLED_BY_DEFAULT
-#else
-      base::FEATURE_ENABLED_BY_DEFAULT
-#endif
-};
+    "OmniboxGroupSuggestionsBySearchVsUrl", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Feature used to enable local entity suggestions. Similar to rich entities but
 // but location specific. E.g., typing 'starbucks near' could display the local
@@ -271,14 +265,8 @@ const base::Feature kDebounceDocumentProvider{
     "OmniboxDebounceDocumentProvider", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Exempts the default match from demotion-by-type.
-const base::Feature kOmniboxPreserveDefaultMatchScore {
-  "OmniboxPreserveDefaultMatchScore",
-#if defined(OS_IOS)
-      base::FEATURE_DISABLED_BY_DEFAULT
-#else
-      base::FEATURE_ENABLED_BY_DEFAULT
-#endif
-};
+const base::Feature kOmniboxPreserveDefaultMatchScore{
+    "OmniboxPreserveDefaultMatchScore", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Preserves the default match against change when providers return results
 // asynchronously. This prevents the default match from changing after the user