[ios showcase] Removes ios/web dependency re-land.

Showcase is intended to be a standalone UI app and as such should not reference 
//ios/web or //ios/chrome. This CL eliminates the Showcase app creating an IOSChromeMain 
instance and thus implicitly being an //ios/web embedder, instead directly inlining the 
minimal parts of that startup that are needed (initializing base::CommandLine and loading resources).
 
As part of that change, this CL eliminates Showcase bundling //ios/web resources.

Bug: 738880
Change-Id: Idcd7849927e1d56fa1958de34e145beb362f4c3a
Reviewed-on: https://chromium-review.googlesource.com/568243
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Louis Romero <lpromero@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486253}

ios/showcase/BUILD.gn

@@ -6,7 +6,6 @@ import("//build/config/ios/rules.gni")
 import("//ios/build/chrome_build.gni")
 import("//ios/build/config.gni")
 import("//ios/third_party/earl_grey/ios_eg_test.gni")
-import("//tools/grit/repack.gni")
 
 ios_app_bundle("showcase") {
   info_plist = "core/Info.plist"
@@ -14,7 +13,6 @@ ios_app_bundle("showcase") {
   output_name = "Showcase"
   deps = [
     ":features",
-    ":packed_resources",
     "//ios/showcase/core:main",
 
     # All shared libraries must have the sanitizer deps to properly link in
@@ -49,23 +47,11 @@ group("all_tests") {
   ]
 }
 
-repack("packed_resources") {
-  sources = [
-    "$root_gen_dir/ios/web/ios_web_resources.pak",
-  ]
-  deps = [
-    "//ios/web:resources",
-  ]
-  output = "$target_gen_dir/showcase_resources.pak"
-  copy_data_to_bundle = true
-}
-
 ios_eg_test("ios_showcase_egtests") {
   info_plist = "core/Info.plist"
   extra_substitutions = [ "IOS_BUNDLE_ID_PREFIX=$ios_app_bundle_id_prefix" ]
   deps = [
     ":features",
-    ":packed_resources",
     "//ios/showcase/core:main",
 
     # Add all eg_tests targets below.

ios/showcase/DEPS

@@ -4,6 +4,5 @@ include_rules = [
   "+ios/clean",
   "+ios/third_party/material_components_ios",
   "+ios/third_party/material_roboto_font_loader_ios",
-  "+ios/web/public",
   "+ui/base",
 ]

ios/showcase/core/BUILD.gn

@@ -13,15 +13,10 @@ source_set("core") {
   ]
   deps = [
     "//base",
-    "//ios/chrome/app/startup:startup_basic",
+    "//base:i18n",
     "//ios/showcase/common",
     "//ios/third_party/material_components_ios",
     "//ios/third_party/material_roboto_font_loader_ios",
-
-    # TODO(crbug.com/738880): Showcase ideally shouldn't be an embedder of
-    # //ios/web.
-    "//ios/web",
-    "//ios/web/public/app",
     "//ui/base",
   ]
   libs = [ "UIKit.framework" ]

ios/showcase/core/app_delegate.mm

@@ -4,14 +4,13 @@
 
 #import "ios/showcase/core/app_delegate.h"
 
+#include "base/command_line.h"
+#include "base/i18n/icu_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/path_service.h"
-#include "ios/chrome/app/startup/ios_chrome_main.h"
 #import "ios/showcase/core/showcase_model.h"
 #import "ios/showcase/core/showcase_view_controller.h"
 #import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
-#import "ios/web/public/app/web_main_parts.h"
-#import "ios/web/public/web_client.h"
 #include "ui/base/resource/resource_bundle.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ -21,42 +20,6 @@
 @implementation AppDelegate
 @synthesize window = _window;
 
-namespace {
-
-class ShowcaseWebMainParts : public web::WebMainParts {
-  void PreMainMessageLoopStart() override {
-    ResourceBundle::InitSharedInstanceWithLocale(
-        std::string(), nullptr, ResourceBundle::LOAD_COMMON_RESOURCES);
-
-    base::FilePath pak_path;
-    PathService::Get(base::DIR_MODULE, &pak_path);
-    ResourceBundle::GetSharedInstance().AddDataPackFromPath(
-        pak_path.AppendASCII("showcase_resources.pak"), ui::SCALE_FACTOR_100P);
-  }
-};
-
-class ShowcaseWebClient : public web::WebClient {
- public:
-  ShowcaseWebClient() {}
-  ~ShowcaseWebClient() override {}
-
-  // WebClient implementation.
-  std::unique_ptr<web::WebMainParts> CreateWebMainParts() override {
-    return base::MakeUnique<ShowcaseWebMainParts>();
-  }
-  base::StringPiece GetDataResource(
-      int resource_id,
-      ui::ScaleFactor scale_factor) const override {
-    return ResourceBundle::GetSharedInstance().GetRawDataResourceForScale(
-        resource_id, scale_factor);
-  }
-  base::RefCountedMemory* GetDataResourceBytes(int resource_id) const override {
-    return ResourceBundle::GetSharedInstance().LoadDataResourceBytes(
-        resource_id);
-  }
-};
-}
-
 - (void)setupUI {
   ShowcaseViewController* viewController =
       [[ShowcaseViewController alloc] initWithRows:[AppDelegate rowsToDisplay]];
@@ -69,11 +32,10 @@ class ShowcaseWebClient : public web::WebClient {
 
 - (BOOL)application:(UIApplication*)application
     didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
-  // TODO(crbug.com/738880): Showcase ideally shouldn't be an embedder of
-  // //ios/web, in which case it wouldn't have to do this. This almost
-  // certainly means not creating IOSChromeMain.
-  web::SetWebClient(new ShowcaseWebClient());
-  base::MakeUnique<IOSChromeMain>();
+  base::CommandLine::Init(0, nullptr);
+  ResourceBundle::InitSharedInstanceWithLocale(
+      std::string(), nullptr, ResourceBundle::LOAD_COMMON_RESOURCES);
+  CHECK(base::i18n::InitializeICU());
 
   self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
   [self setupUI];