Fix for unused-lambda-capture warning

This CL is part of
https://chromium-review.googlesource.com/c/chromium/src/+/1286017

This CL was uploaded by git cl split.

R=xiyuan@chromium.org

Bug: 681136
Change-Id: I54485b40c1808525659f4af61369a04819c40e06
Reviewed-on: https://chromium-review.googlesource.com/c/1288493Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600756}

ash/frame/non_client_frame_view_ash_unittest.cc

@@ -432,8 +432,7 @@ TEST_F(NonClientFrameViewAshTest, HeaderVisibilityInOverviewMode) {
 }
 
 TEST_F(NonClientFrameViewAshTest, HeaderVisibilityInSplitview) {
-  auto create_widget = [this](
-                           NonClientFrameViewAshTestWidgetDelegate* delegate) {
+  auto create_widget = [](NonClientFrameViewAshTestWidgetDelegate* delegate) {
     std::unique_ptr<views::Widget> widget = CreateTestWidget(delegate);
     // Windows need to be resizable and maximizable to be used in splitview.
     widget->GetNativeWindow()->SetProperty(