Update to Chromium version 70.0.3538.0 (#587811)

Known issues:
- The CefLoadCRLSetsFile function needs to be re-implemented (see issue #2497).
- Linux: GTK2 support has been removed. The cefclient sample needs to be updated
  to use GTK3 (see issue #2014).

libcef/browser/net/network_delegate.h

@@ -41,12 +41,10 @@ class CefNetworkDelegate : public net::NetworkDelegateImpl {
                    bool started,
                    int net_error) override;
   bool OnCanGetCookies(const net::URLRequest& request,
-                       const net::CookieList& cookie_list,
-                       bool allowed_from_caller) override;
+                       const net::CookieList& cookie_list) override;
   bool OnCanSetCookie(const net::URLRequest& request,
                       const net::CanonicalCookie& cookie,
-                      net::CookieOptions* options,
-                      bool allowed_from_caller) override;
+                      net::CookieOptions* options) override;
   bool OnCanAccessFile(const net::URLRequest& request,
                        const base::FilePath& original_path,
                        const base::FilePath& absolute_path) const override;