RFR: 8313711: Cherry-pick webkitgtk-2.40.5 stabilzation fixes

[Hima Bindu Meda]

Cherry-picked commits from webkitgtk-2.40.5.
Verified build on windows, mac and linux. Sanity testing looks fine. No issues seen

-------------

Commit messages:
 - white space correction
 - cherry-pick webkit-2.40.5

Changes: https://git.openjdk.org/jfx/pull/1196/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1196&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313711
  Stats: 636 lines in 88 files changed: 320 ins; 150 del; 166 mod
  Patch: https://git.openjdk.org/jfx/pull/1196.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1196/head:pull/1196

PR: https://git.openjdk.org/jfx/pull/1196