Roll src/third_party/WebKit 37d011b:e52e8b6 (svn 190884:190900)

Summary of changes available at:
https://chromium.googlesource.com/chromium/blink/+log/37d011b..e52e8b6

TBR=timvolodine@chromium.org

Review URL: https://codereview.chromium.org/961623002

Cr-Commit-Position: refs/heads/master@{#318215}

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': '37d011b0de3833729bb612839421ed32f3b15603', # from svn revision 190884
+  'webkit_revision': 'e52e8b6dd335345ed68e2331ff1c05fb7ef66fda', # from svn revision 190900
   'chromium_git': 'https://chromium.googlesource.com',
   'chromiumos_git': 'https://chromium.googlesource.com/chromiumos',
   'pdfium_git': 'https://pdfium.googlesource.com',