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=chrishtr@chromium.org

Bug: 681136
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ib2e84f9aef18ed801d27f74520edeb7e41eda54b
Reviewed-on: https://chromium-review.googlesource.com/c/1288494Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600985}

third_party/blink/renderer/platform/graphics/paint/paint_controller_test.cc

@@ -896,7 +896,7 @@ TEST_P(PaintControllerTest, CachedSubsequenceContainingFragments) {
   FakeDisplayItemClient container("container");
 
   // The first paint.
-  auto paint_container = [this, &context, &container, kFragmentCount]() {
+  auto paint_container = [this, &context, &container]() {
     SubsequenceRecorder r(context, container);
     for (size_t i = 0; i < kFragmentCount; ++i) {
       ScopedDisplayItemFragment scoped_fragment(context, i);