[ios] Extracted web_test.h classes into separate files.

ios/web/public/test/web_test.mm

+// 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.
+
+#include "ios/web/public/test/web_test.h"
+
+#include "base/memory/ptr_util.h"
+#import "ios/web/public/active_state_manager.h"
+#import "ios/web/public/test/test_web_client.h"
+
+namespace web {
+
+WebTest::WebTest() : web_client_(base::WrapUnique(new TestWebClient)) {}
+
+WebTest::~WebTest() {}
+
+void WebTest::SetUp() {
+  PlatformTest::SetUp();
+  BrowserState::GetActiveStateManager(&browser_state_)->SetActive(true);
+}
+
+void WebTest::TearDown() {
+  BrowserState::GetActiveStateManager(&browser_state_)->SetActive(false);
+  PlatformTest::TearDown();
+}
+
+TestWebClient* WebTest::GetWebClient() {
+  return static_cast<TestWebClient*>(web_client_.Get());
+}
+
+BrowserState* WebTest::GetBrowserState() {
+  return &browser_state_;
+}
+
+}  // namespace web