Roll src/third_party/WebKit f3e1a64:06742c8 (svn 191045:191046)

Summary of changes available at:
https://chromium.googlesource.com/chromium/blink/+log/f3e1a64..06742c8

TBR=

Review URL: https://codereview.chromium.org/968663003

Cr-Commit-Position: refs/heads/master@{#318616}

DEPS

@@ -34,7 +34,7 @@ vars = {
   'llvm_url': 'http://src.chromium.org/llvm-project',
   'llvm_git': 'https://llvm.googlesource.com',
   'webkit_trunk': 'http://src.chromium.org/blink/trunk',
-  'webkit_revision': 'f3e1a647687f2e61fd81d8511705956f1170f9c4', # from svn revision 191045
+  'webkit_revision': '06742c8a4b693c27557ec63490b6d4d485d81c67', # from svn revision 191046
   'chromium_git': 'https://chromium.googlesource.com',
   'chromiumos_git': 'https://chromium.googlesource.com/chromiumos',
   'pdfium_git': 'https://pdfium.googlesource.com',