RFR: JDK-8310681: Update WebKit to 616.1 [v2]

[Hima Bindu Meda]

> Updated JavaFX Webkit to GTK WebKit 2.40 (616.1).
> Verified the updated version build, sanity tests and stability. No issues have been observed.

Hima Bindu Meda has updated the pull request incrementally with one additional commit since the last revision:

  Remove check for PLATFORM(JAVA) as the change corresponds to webkit upstream

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1180/files
  - new: https://git.openjdk.org/jfx/pull/1180/files/5039b04b..3362baa6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1180&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1180&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1180.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1180/head:pull/1180

PR: https://git.openjdk.org/jfx/pull/1180