Remove redundant call to SetShouldDoFullPaintInvalidation()

Remove call to SetShouldDoFullPaintInvalidation()
in LayoutBlockFlow::DetermineStartPosition() that was done just after
SetNeedsLayoutAndFullPaintInvalidation(), as this is already called
at the end of that method.

Change-Id: If53e4e3e5aba9a6f3c424d3f5b805151fd9223b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834084Reviewed-by: Emil A Eklund <eae@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Manuel Rego <rego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#702160}

third_party/blink/renderer/core/layout/layout_block_flow_line.cc

@@ -2128,7 +2128,6 @@ RootInlineBox* LayoutBlockFlow::DetermineStartPosition(
     if (layout_state.HasInlineChild() && !SelfNeedsLayout()) {
       SetNeedsLayoutAndFullPaintInvalidation(
           layout_invalidation_reason::kFloatDescendantChanged, kMarkOnlyThis);
-      SetShouldDoFullPaintInvalidation();
     }
 
     DeleteLineBoxTree();