Remove unnecessary pixel expectations (except platform/win platform/mac)

Remove unnecessary pixel expectations (except platform/win platform/mac)

The pixel expectations existed when the tests were pixel tests but now the
tests are text-only tests.

CL was generated with the following python script:
files = subprocess.Popen(['find', '.', '-type', 'f', '-not', '-name', '*-expected.*'], stdout=subprocess.PIPE).stdout.readlines()
for f in files:
  f = f.strip()
  c = open(f).read()
  if (c.find('text-based-repaint.js') != -1 and c.find('runRepaintAndPixelTest') == -1) or c.find('testRunner.dumpAsText()') != -1:
    test_name = re.sub('\.[a-z]*$', '', f)
    os.system('rm ' + test_name + '-expected.png' + ' platform/*/' + test_name + '-expected.png')

False positives are restored manually according to trybot results.

R=dpranke@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179862

[Xianzhu, 2014-08-08 18:59:49]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2014-08-08 19:01:47]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/wangxianzhu@chromium.org/453733002/20001

[Dirk Pranke, 2014-08-08 19:22:48]

lgtm

[commit-bot: I haz the power, 2014-08-08 19:56:44]

Change committed as 179862