RFR: 8349924: Additional WebKit 620.1 fixes from WebKitGTK 2.46.6 [v2]

[Jay Bhaskar]

> WebkitGTK 2.46.6 has additional fixes for crash and rendering issue, the crash fix is related to Skia CPU rendering which does not apply to JavaFX Webkit. 
> This patch has been tested on Jenkins and there is no side effects introduced.

Jay Bhaskar has updated the pull request incrementally with one additional commit since the last revision:

  remove Configurations folder becuase it is not required

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1722/files
  - new: https://git.openjdk.org/jfx/pull/1722/files/c14365f1..3b4a5f86

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1722&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1722&range=00-01

  Stats: 554 lines in 8 files changed: 0 ins; 554 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1722.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1722/head:pull/1722

PR: https://git.openjdk.org/jfx/pull/1722