[chromium] correct coding oversight for clang
https://bugs.webkit.org/show_bug.cgi?id=101513

Reviewed by Kent Tamura.

https://bugs.webkit.org/show_bug.cgi?id=100675 contains an
incorrect declaration that precludes compiling embedder code
with clang: patch changes class to struct appropriately.

* chromium/public/WebGestureCurveTarget.h:
(WebKit):


git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@133901 268f45cc-cd09-0410-ab3c-d52691b4dbfc