Remove //third_party/WebKit/PerformanceTests/.gitattributes

- PageLoad/ didn't exist.

- jquery-1.3.2.js: This file had CRLF line endings until [1], and
  "-crlf" preserved CRLFs. However now it has LF line endings and we
  recommend to set "core.autocrlf false" [2], so the "-crlf" setting
  has no effect.

[1] crrev.com/056fd80b
[2] http://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html

Bug: 829695
Change-Id: I0618beaef25e13304ced653a0adc5c8e35f4c42b
Reviewed-on: https://chromium-review.googlesource.com/1025411Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553343}

third_party/WebKit/PerformanceTests/.gitattributes

-PageLoad/svg/files/Harvey_Rayner.svg -crlf
-PageLoad/svg/files/cacuts_02.svg -crlf
-PageLoad/svg/files/crawfish2_ganson.svg -crlf
-PageLoad/svg/files/france.svg -crlf
-PageLoad/svg/files/mtsthelens.svg -crlf
-PageLoad/svg/files/worldcup.svg -crlf
-SunSpider/tests/parse-only/jquery-1.3.2.js -crlf