Rebase expectation of two tests with shadow and canvas

Two tests were marked as flaky because they were missing the updated
expectations.

This CL removes them from the TestExpectations and add rebases the
missing expectation files.

Bug: 990918
Change-Id: I3e33204fca1d5e93a73c4c2167a016fb41a694ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2180879Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Commit-Queue: Juanmi Huertas <juanmihd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776046}

third_party/blink/web_tests/TestExpectations

@@ -5044,10 +5044,6 @@ crbug.com/766404 [ Mac ] plugins/keyboard-events.html [ Pass Failure ]
 # This was previously skipped on Windows in the section for crbug.com/757165
 crbug.com/775957 virtual/gpu/fast/canvas/canvas-incremental-repaint.html [ Skip ]
 
-# Canvas tests that are affected by change to Skia GPU rect shadow rendering.
-crbug.com/990918 virtual/gpu/fast/canvas/canvas-shadow-source-in.html [ Pass Failure ]
-crbug.com/990918 virtual/gpu/fast/canvas/canvas-composite-shadow.html [ Pass Failure ]
-
 # Sheriff failures 2017-09-21
 crbug.com/767469 http/tests/navigation/start-load-during-provisional-loader-detach.html [ Pass Failure ]
 

third_party/blink/web_tests/platform/mac/virtual/display_list_2d_canvas/fast/canvas/canvas-shadow-source-in-expected.txt

-layer at (0,0) size 800x600
-  LayoutView at (0,0) size 800x600
-layer at (0,0) size 800x464
-  LayoutBlockFlow {HTML} at (0,0) size 800x464
-    LayoutBlockFlow {BODY} at (8,8) size 784x448
-      LayoutBlockFlow {DIV} at (0,0) size 784x18
-        LayoutText {#text} at (0,0) size 60x18
-          text run at (0,0) width 60: "Test Rect"
-      LayoutBlockFlow (anonymous) at (0,18) size 784x206
-        LayoutText {#text} at (0,0) size 0x0
-      LayoutBlockFlow {DIV} at (0,224) size 784x18
-        LayoutText {#text} at (0,0) size 71x18
-          text run at (0,0) width 71: "Test Image"
-      LayoutBlockFlow (anonymous) at (0,242) size 784x206
-        LayoutText {#text} at (0,0) size 0x0
-layer at (8,26) size 202x202
-  LayoutHTMLCanvas {CANVAS} at (0,0) size 202x202 [border: (1px solid #999999)]
-layer at (8,250) size 202x202
-  LayoutHTMLCanvas {CANVAS} at (0,0) size 202x202 [border: (1px solid #999999)]