Enable overlay scrollbars on ChromeOS

chrome/renderer/autofill/form_classifier_browsertest.cc

 // 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 "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/test/base/chrome_render_view_test.h"
 #include "components/autofill/content/renderer/form_classifier.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebFormElement.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
+#include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
+#include "ui/native_theme/native_theme_switches.h"
 
 namespace autofill {
 
 class FormClassifierTest : public ChromeRenderViewTest {
  public:
   FormClassifierTest() {}
 
+  void SetUp() override {
+    blink::WebRuntimeFeatures::enableOverlayScrollbars(
+        ui::IsOverlayScrollbarEnabled());
+    ChromeRenderViewTest::SetUp();
+  }
+
   void TearDown() override {
     LoadHTML("");
     ChromeRenderViewTest::TearDown();
   }
 
   bool GetGenerationField(std::string* generation_field) {
     blink::WebDocument document = GetMainFrame()->document();
     blink::WebFormElement form =
         document.getElementById("test_form").to<blink::WebFormElement>();
     base::string16 generation_field16;
@@ skipping 197 matching lines @@
 }
 
 TEST_F(FormClassifierTest, kChangeFormWithTreePasswordFieldsHTML) {
   LoadHTML(kChangeFormWithTreePasswordFieldsHTML);
   std::string generation_field;
   EXPECT_TRUE(GetGenerationField(&generation_field));
   EXPECT_EQ("password", generation_field);
 }
 
 }  // namespace autofill