Revert "Disable Instant Extended limit by default for Android."

This reverts commit 3b71610c.

Reason for revert: we will be doing staged rollout. this cl would go live may 19, which is too early.

Original change's description:
> Disable Instant Extended limit by default for Android.
> 
> This change effectively increases number of search results
> on Android devices from default (3).
> 
> Bug: 964049
> Change-Id: I46887f88e3f76801d24f7dfdf928397e6a3ae66f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132858
> Reviewed-by: Tommy Li <tommycli@chromium.org>
> Commit-Queue: Ender <ender@google.com>
> Cr-Commit-Position: refs/heads/master@{#755543}

TBR=tommycli@chromium.org,ender@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 964049
Change-Id: I9102a3849018f366b98044921ae711eb8321bbb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2176653Reviewed-by: Ender <ender@google.com>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Ender <ender@google.com>
Cr-Commit-Position: refs/heads/master@{#764863}

components/omnibox/common/omnibox_features.cc

@@ -188,13 +188,7 @@ const base::Feature kAutocompleteTitles{"OmniboxAutocompleteTitles",
 // Returns whether IsInstantExtendedAPIEnabled should be ignored when deciding
 // the number of Google-provided search suggestions.
 const base::Feature kOmniboxDisableInstantExtendedLimit{
-  "OmniboxDisableInstantExtendedLimit",
-#if defined(OS_ANDROID)
-      base::FEATURE_ENABLED_BY_DEFAULT
-#else
-      base::FEATURE_DISABLED_BY_DEFAULT
-#endif
-};
+    "OmniboxDisableInstantExtendedLimit", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Show the search engine logo in the omnibox on Android (desktop already does
 // this).