Auto-rebaseline for r422210

https://chromium.googlesource.com/chromium/src/+/5556b4bf5

BUG=637264
TBR=malaykeshav@chromium.org

Review URL: https://codereview.chromium.org/2392783002 .

Cr-Commit-Position: refs/heads/master@{#422602}

third_party/WebKit/LayoutTests/TestExpectations

@@ -229,8 +229,6 @@ crbug.com/248938 [ Linux ] virtual/threaded/transitions/unprefixed-perspective-o
 crbug.com/248938 [ Linux ] virtual/threaded/transitions/transition-not-interpolable.html [ Pass Timeout ]
 crbug.com/248938 [ Mac ] virtual/threaded/transitions/interrupted-all-transition.html [ Pass Failure ]
 
-crbug.com/637264 fast/hidpi/scrollbar-appearance-increase-device-scale-factor.html [ NeedsRebaseline ]
-crbug.com/637264 fast/hidpi/scrollbar-appearance-decrease-device-scale-factor.html  [ NeedsRebaseline ]
 crbug.com/640256 [ Linux ] compositing/tiled-layers-hidpi.html [ NeedsRebaseline ]
 crbug.com/640256 [ Linux ] css3/filters/effect-reference-hidpi-hw.html [ NeedsRebaseline ]
 crbug.com/640256 [ Linux ] css3/filters/effect-reference-hidpi.html [ NeedsRebaseline ]

third_party/WebKit/LayoutTests/platform/mac/fast/hidpi/scrollbar-appearance-decrease-device-scale-factor-expected.txt

+layer at (0,0) size 800x600
+  LayoutView at (0,0) size 800x600
+layer at (0,0) size 800x136
+  LayoutBlockFlow {HTML} at (0,0) size 800x136
+    LayoutBlockFlow {BODY} at (8,8) size 784x120
+layer at (8,8) size 200x120 clip at (8,8) size 185x105 scrollWidth 400 scrollHeight 272
+  LayoutBlockFlow {DIV} at (0,0) size 200x120
+    LayoutBlockFlow (anonymous) at (0,0) size 185x72
+      LayoutBR {BR} at (0,0) size 0x18
+      LayoutText {#text} at (0,18) size 181x54
+        text run at (0,18) width 172: "This should be a scrollable"
+        text run at (0,36) width 181: "text box with horizontal and"
+        text run at (0,54) width 92: "vertical scroll."
+    LayoutBlockFlow {DIV} at (0,72) size 400x200

third_party/WebKit/LayoutTests/platform/mac/fast/hidpi/scrollbar-appearance-increase-device-scale-factor-expected.txt

+layer at (0,0) size 800x600
+  LayoutView at (0,0) size 800x600
+layer at (0,0) size 800x136
+  LayoutBlockFlow {HTML} at (0,0) size 800x136
+    LayoutBlockFlow {BODY} at (8,8) size 784x120
+layer at (8,8) size 200x120 clip at (8,8) size 185x105 scrollWidth 400 scrollHeight 272
+  LayoutBlockFlow {DIV} at (0,0) size 200x120
+    LayoutBlockFlow (anonymous) at (0,0) size 185x72
+      LayoutBR {BR} at (0,0) size 0x18
+      LayoutText {#text} at (0,18) size 181x54
+        text run at (0,18) width 172: "This should be a scrollable"
+        text run at (0,36) width 181: "text box with horizontal and"
+        text run at (0,54) width 92: "vertical scroll."
+    LayoutBlockFlow {DIV} at (0,72) size 400x200

third_party/WebKit/LayoutTests/platform/win/fast/hidpi/scrollbar-appearance-decrease-device-scale-factor-expected.txt

+layer at (0,0) size 800x600
+  LayoutView at (0,0) size 800x600
+layer at (0,0) size 800x136
+  LayoutBlockFlow {HTML} at (0,0) size 800x136
+    LayoutBlockFlow {BODY} at (8,8) size 784x120
+layer at (8,8) size 200x120 clip at (8,8) size 185x105 scrollWidth 400 scrollHeight 290
+  LayoutBlockFlow {DIV} at (0,0) size 200x120
+    LayoutBlockFlow (anonymous) at (0,0) size 155x90
+      LayoutBR {BR} at (0,0) size 0x17
+      LayoutText {#text} at (0,18) size 151x71
+        text run at (0,18) width 106: "This should be a"
+        text run at (0,36) width 151: "scrollable text box with"
+        text run at (0,54) width 144: "horizontal and vertical"
+        text run at (0,72) width 40: "scroll."
+    LayoutBlockFlow {DIV} at (0,90) size 400x200

third_party/WebKit/LayoutTests/platform/win/fast/hidpi/scrollbar-appearance-increase-device-scale-factor-expected.txt

+layer at (0,0) size 2400x1800
+  LayoutView at (0,0) size 2400x1800
+layer at (0,0) size 2400x408
+  LayoutBlockFlow {HTML} at (0,0) size 2400x408
+    LayoutBlockFlow {BODY} at (24,24) size 2352x360
+layer at (24,24) size 600x360 clip at (24,24) size 555x315 scrollWidth 1200 scrollHeight 820
+  LayoutBlockFlow {DIV} at (0,0) size 600x360
+    LayoutBlockFlow (anonymous) at (0,0) size 585x220
+      LayoutBR {BR} at (0,1) size 0x53
+      LayoutText {#text} at (0,56) size 542x163
+        text run at (0,56) width 515: "This should be a scrollable"
+        text run at (0,111) width 542: "text box with horizontal and"
+        text run at (0,166) width 275: "vertical scroll."
+    LayoutBlockFlow {DIV} at (0,220) size 1200x600