[SPv175] Change a SPv2 condition to SPv175 in CaretDisplayItemClient

The condition actually applies to all SPv175+.

Bug: 771643
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I8f0910050c2e3e4b9b80a076bb951feaacf31166
Reviewed-on: https://chromium-review.googlesource.com/876956Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530653}

third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v175

@@ -91,7 +91,6 @@ crbug.com/771643 css3/filters/empty-element-with-filter.html [ Failure ]
 crbug.com/771643 css3/filters/filterRegions.html [ Failure ]
 crbug.com/771643 external/wpt/css/css-backgrounds/background-attachment-local/attachment-local-clipping-color-5.html [ Failure ]
 crbug.com/771643 external/wpt/css/css-backgrounds/background-attachment-local/attachment-local-clipping-image-5.html [ Failure ]
-crbug.com/771643 fast/forms/focus-on-control-with-zero-size.html [ Crash ]
 crbug.com/771643 fast/reflections/reflection-masks-outset.html [ Pass Failure ]
 crbug.com/771643 fast/replaced/width100percent-textarea.html [ Failure ]
 crbug.com/771643 http/tests/misc/slow-loading-mask.html [ Failure ]

third_party/WebKit/Source/core/editing/CaretDisplayItemClient.cpp

@@ -252,10 +252,10 @@ void CaretDisplayItemClient::InvalidatePaintInCurrentLayoutBlock(
     // paint invalidation.
     if (IsImmediateFullPaintInvalidationReason(
             layout_block_->FullPaintInvalidationReason()) ||
-        // For non-SPv2, kSubtreeInvalidationChecking may hint change of
+        // For SPv1, kSubtreeInvalidationChecking may hint change of
         // paint offset. See ObjectPaintInvalidatorWithContext::
         // invalidatePaintIfNeededWithComputedReason().
-        (!RuntimeEnabledFeatures::SlimmingPaintV2Enabled() &&
+        (!RuntimeEnabledFeatures::SlimmingPaintV175Enabled() &&
          (context.subtree_flags &
           PaintInvalidatorContext::kSubtreeInvalidationChecking))) {
       object_invalidator.InvalidateDisplayItemClient(