RFR: 8349924: Additional WebKit 620.1 fixes from WebKitGTK 2.46.6

[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.

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Commit messages:
 - Fix trailing white space and tab
 - webkit gtk cherrypick 2.46.6

Changes: https://git.openjdk.org/jfx/pull/1722/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1722&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349924
  Stats: 3487 lines in 116 files changed: 1823 ins; 1316 del; 348 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