[omnibox] Disable the instant extended limit on iOS.

This is in preparation for launch. Metrics report:
https://docs.google.com/document/d/1QmvnzeFeFOHx4Bk0MwQCJ261sYSqgrrFFUQUQB4ecUI/edit

Bug: 964049
Change-Id: I5c97ca2dd4c5f00a9340c64261e33fd8213d6b6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391644
Reviewed-by: Stepan Khapugin <[email protected]>
Reviewed-by: Mark Pearson <[email protected]>
Commit-Queue: Justin Donnelly <[email protected]>
Cr-Commit-Position: refs/heads/master@{#804363}
diff --git a/components/omnibox/common/omnibox_features.cc b/components/omnibox/common/omnibox_features.cc
index ebebedd..22dbd2e 100644
--- a/components/omnibox/common/omnibox_features.cc
+++ b/components/omnibox/common/omnibox_features.cc
@@ -43,6 +43,13 @@
     base::FEATURE_ENABLED_BY_DEFAULT;
 #endif
 
+const auto enabled_by_default_android_ios =
+#if defined(OS_ANDROID) || defined(OS_IOS)
+    base::FEATURE_ENABLED_BY_DEFAULT;
+#else
+    base::FEATURE_DISABLED_BY_DEFAULT;
+#endif
+
 // Allows Omnibox to dynamically adjust number of offered suggestions to fill in
 // the space between Omnibox an the soft keyboard. The number of suggestions
 // shown will be no less than minimum for the platform (eg. 5 for Android).
@@ -127,7 +134,7 @@
 // Returns whether IsInstantExtendedAPIEnabled should be ignored when deciding
 // the number of Google-provided search suggestions.
 const base::Feature kOmniboxDisableInstantExtendedLimit{
-    "OmniboxDisableInstantExtendedLimit", enabled_by_default_android_only};
+    "OmniboxDisableInstantExtendedLimit", enabled_by_default_android_ios};
 
 // Show the search engine logo in the omnibox on Android (desktop already does
 // this).