Rebaseline text expectation of fast/reflections/reflection-masks-outs…

…et.html

The test seems still flaky, but the incorrect text expectation shadowed
the image flakiness. Rebaseline the text expectations to expose the real
image flakiness.

Bug: 777259
Change-Id: I176c37017288122becd018aa154f44465b5e574c
Reviewed-on: https://chromium-review.googlesource.com/774501
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517192}

third_party/WebKit/LayoutTests/platform/mac/fast/reflections/reflection-masks-outset-expected.txt

@@ -0,0 +1,8 @@
+layer at (0,0) size 800x600
+  LayoutView at (0,0) size 800x600
+layer at (0,0) size 800x356
+  LayoutBlockFlow {HTML} at (0,0) size 800x356
+    LayoutBlockFlow {BODY} at (8,8) size 784x340
+      LayoutText {#text} at (0,0) size 0x0
+layer at (28,28) size 335x296
+  LayoutImage {IMG} at (20,20) size 335x296