Compile activity_service_controller_egtest.mm with EG2.

This CL makes changes to the file so it compiles with EG2,
the test is not added to EG2 target yet.

Notable changes:
 - Replaced #import <EarlGrey/EarlGrey.h> with
   #import "ios/testing/earl_grey/earl_grey_test.h"
 - Removed unused headers

Bug: 922813
Change-Id: I07ce60469de869d1c4281658c29a6ae0cbc5aa77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637937Reviewed-by: Mohammad Refaat <mrefaat@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665236}

ios/chrome/browser/ui/activity_services/BUILD.gn

@@ -125,6 +125,7 @@ source_set("unit_tests") {
 
 source_set("eg_tests") {
   configs += [ "//build/config/compiler:enable_arc" ]
+  defines = [ "CHROME_EARL_GREY_1" ]
   testonly = true
   sources = [
     "activity_service_controller_egtest.mm",
@@ -136,6 +137,7 @@ source_set("eg_tests") {
     "//ios/chrome/browser/ui/util",
     "//ios/chrome/test/app:test_support",
     "//ios/chrome/test/earl_grey:test_support",
+    "//ios/testing/earl_grey:earl_grey_support",
     "//ios/third_party/material_components_ios",
     "//ios/web:earl_grey_test_support",
     "//ios/web/public/test",

ios/chrome/browser/ui/activity_services/activity_service_controller_egtest.mm

@@ -2,23 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#import <EarlGrey/EarlGrey.h>
 #import <XCTest/XCTest.h>
 
 #include <memory>
 
-#include "base/ios/ios_util.h"
 #include "components/strings/grit/components_strings.h"
-#import "ios/chrome/browser/ui/util/uikit_ui_util.h"
 #include "ios/chrome/grit/ios_strings.h"
-#import "ios/chrome/test/app/chrome_test_util.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey_ui.h"
 #import "ios/chrome/test/earl_grey/chrome_error_util.h"
 #import "ios/chrome/test/earl_grey/chrome_matchers.h"
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
-#import "ios/third_party/material_components_ios/src/components/Snackbar/src/MaterialSnackbar.h"
-#import "ios/web/public/test/earl_grey/web_view_matchers.h"
+#import "ios/testing/earl_grey/earl_grey_test.h"
 #include "ios/web/public/test/http_server/error_page_response_provider.h"
 #import "ios/web/public/test/http_server/http_server.h"
 #include "ios/web/public/test/http_server/http_server_util.h"