Remove `SKIP` expectations for Mac tests related to scroll animations.

These layout tests were skipped on Mac since it used to be impossible to enable
scroll animations on a per-test basis in Mac. This was fixed in r376025 so these
tests should be able to run now.

BUG=364614

Review URL: https://codereview.chromium.org/1897973006

Cr-Commit-Position: refs/heads/master@{#388619}

third_party/WebKit/LayoutTests/TestExpectations

@@ -905,13 +905,6 @@ crbug.com/385014 crbug.com/410145 accessibility/canvas-fallback-content-2.html [
 
 crbug.com/440452 virtual/display_list_2d_canvas/fast/canvas/canvas-partial-invalidation-zoomed.html [ Pass Timeout ]
 
-crbug.com/364614 [ Mac ] fast/scroll-behavior/overflow-scroll-animates.html [ Skip ]
-crbug.com/364614 [ Mac ] virtual/threaded/fast/scroll-behavior/overflow-scroll-animates.html [ Skip ]
-crbug.com/364614 [ Mac ] virtual/scroll_customization/fast/scroll-behavior/overflow-scroll-animates.html [ Skip ]
-crbug.com/364614 [ Mac ] fast/scroll-behavior/overflow-scroll-root-frame-animates.html [ Skip ]
-crbug.com/364614 [ Mac ] virtual/threaded/fast/scroll-behavior/overflow-scroll-root-frame-animates.html [ Skip ]
-crbug.com/364614 [ Mac ] virtual/scroll_customization/fast/scroll-behavior/overflow-scroll-root-frame-animates.html [ Skip ]
-
 crbug.com/574283 [ Mac ] virtual/threaded/fast/scroll-behavior/smooth-scroll/fixed-background-in-iframe.html [ Skip ]
 crbug.com/574283 [ Mac ] virtual/threaded/fast/scroll-behavior/smooth-scroll/horizontal-smooth-scroll-in-rtl.html [ Skip ]
 crbug.com/574283 [ Mac ] virtual/threaded/fast/scroll-behavior/smooth-scroll/main-thread-scrolling-reason-added.html [ Skip ]