[ios] Stop setting omnibox fakebox flag on iPhone.

ios/chrome/browser/ui/toolbar/web_toolbar_controller.mm

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/ui/toolbar/web_toolbar_controller.h"
 
 #import <CoreLocation/CoreLocation.h>
 #include <QuartzCore/QuartzCore.h>
 
 #include <stdint.h>
@@ skipping 1317 matching lines @@
   if (![_webToolbar isHidden])
     [_omniBox becomeFirstResponder];
 }
 
 - (void)cancelOmniboxEdit {
   _locationBar->HideKeyboardAndEndEditing();
   [self updateToolbarState];
 }
 
 - (void)focusFakebox {
-  OmniboxEditModel* model = _locationBar->GetLocationEntry()->model();
-  // Setting the caret visibility to false causes OmniboxEditModel to indicate
-  // that omnibox interaction was initiated from the fakebox. Note that
-  // SetCaretVisibility is a no-op unless OnSetFocus is called first.
-  model->OnSetFocus(false);
-  model->SetCaretVisibility(false);
-
-  if (!IsIPadIdiom()) {
+  if (IsIPadIdiom()) {
+    OmniboxEditModel* model = _locationBar->GetLocationEntry()->model();
+    // Setting the caret visibility to false causes OmniboxEditModel to indicate
+    // that omnibox interaction was initiated from the fakebox. Note that
+    // SetCaretVisibility is a no-op unless OnSetFocus is called first.

[rohitrao (ping after 24h), 2017/01/10 17:18:45]

Add to this explaining why the phone omnibox does not count as a fakebox?

[justincohen, 2017/01/12 18:04:36]

Done.

+    model->OnSetFocus(false);
+    model->SetCaretVisibility(false);
+  } else {
     // Set the omnibox background's frame to full bleed.
     CGRect mobFrame = CGRectInset([_clippingView bounds], -2, -2);
     [_omniboxBackground setFrame:mobFrame];
   }
 
   [self focusOmnibox];
 }
 
 - (void)onFakeboxBlur {
   DCHECK(!IsIPadIdiom());
@@ skipping 1206 matching lines @@
 
 - (BOOL)isPrerenderAnimationRunning {
   return _prerenderAnimating;
 }
 
 - (OmniboxTextFieldIOS*)omnibox {
   return _omniBox.get();
 }
 
 @end