[ios] Fix "Autocomplete Searches and URLs” fails to work as intended

Previously “Autocomplete Searches and URLs” fails to work as intended after enabling “experimental settings > “Enable Sample Policies”.

Bug: 1108313
Change-Id: I83d0d12d5e9f0017f2791a7bc3ba75abc476f3ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315499Reviewed-by: sebsg <sebsg@chromium.org>
Commit-Queue: Tina Wang <tinazwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791235}

ios/chrome/browser/flags/about_flags.mm

@@ -714,9 +714,6 @@ void AppendSwitchesFromExperimentalSettings(base::CommandLine* command_line) {
       base::SysUTF8ToNSString(policy::key::kAutofillCreditCardEnabled),
       base::SysUTF8ToNSString(policy::key::kChromeVariations),
       base::SysUTF8ToNSString(policy::key::kDefaultPopupsSetting),
-      base::SysUTF8ToNSString(policy::key::kDefaultSearchProviderEnabled),
-      base::SysUTF8ToNSString(policy::key::kDefaultSearchProviderSearchURL),
-      base::SysUTF8ToNSString(policy::key::kDefaultSearchProviderKeyword),
       base::SysUTF8ToNSString(policy::key::kPasswordManagerEnabled)
     ];
 
@@ -733,13 +730,6 @@ void AppendSwitchesFromExperimentalSettings(base::CommandLine* command_line) {
       // 2 = Do not allow any site to show popups
       base::SysUTF8ToNSString(policy::key::kDefaultPopupsSetting) : @2,
 
-      base::SysUTF8ToNSString(policy::key::kDefaultSearchProviderEnabled) :
-          @YES,
-      base::SysUTF8ToNSString(policy::key::kDefaultSearchProviderSearchURL) :
-          @"http://www.google.com/?q={searchTerms}",
-      base::SysUTF8ToNSString(policy::key::kDefaultSearchProviderKeyword) :
-          @"google",
-
       base::SysUTF8ToNSString(policy::key::kPasswordManagerEnabled) : @NO,
     };
     NSDictionary* registration_defaults =