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There are two reasons for this CL:
1. This layout test times out on virtual/gpu/ test suite.
2. The layout test is uses testharness, but it has an expected file.

The reason for #1 is that when the test creates a canvas, it uses the
canvas's default width and height which is 300*150, and call getImageData
and putImageData on the entire canvas with the same color. We really don't
need that, this CL sets the width and height to be 5 and should test the
same thing.

The reason for #2 is that this layout test has several small tests, the
name for each small tests are the same, and testharness apparently
doesn't like that.

This CL removes a line in the expectation file, and some -expected.txt

Bug: 709009
Change-Id: I14935f4bf84a8cabb5a9aa56dc502b5d02768b77
Reviewed-on: https://chromium-review.googlesource.com/568079Reviewed-by: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486002}