[iOS] Upstreaming of Info.plist and entitlements generation.

ios/public/provider/chrome/browser/build_config.gni

 # Copyright 2016 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("//build/config/chrome_build.gni")
-
 declare_args() {
   # Label of the target providing application icons.  This target must be a
   # bundle_data target that copy Icon-*.png files in the application bundle.
   ios_application_icons_target = "//ios/chrome/app/resources:chromium_icons"
 
   # Label of the target providing image assets for the launchscreen.  This
   # target must be an asset catalog that contains at least two imagesets, one
   # named "launchscreen_app_logo" and one named "launchscreen_brand_name".
   ios_launchscreen_assets_target =
       "//ios/chrome/app/resources:launchscreen_assets"
 
   # Label of the target providing packed resources (localizable strings,
   # scalable and unscalable resources).  This target must copy the packed
   # resources to the application bundle when depended on.
   ios_packed_resources_target = "//ios/chrome/app/resources:packed_resources"
 
   # Label of the target providing implementation for ChromeBrowserProvider.
   # Overridden when using the Google-internal repository to build Chrome on iOS.
   ios_provider_target = "//ios/chrome/browser/providers:provider_factory"
 }