Disable WebContentsImplBrowserTest.UpdateLoadState due to flakiness.

Bug: 999597
Change-Id: I09d60471bcd5e95f0fed839f7f61e02225ff768e
Tbr: csharrison@chromium.org,mmenke@chromium.org
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1778575Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692132}

content/browser/web_contents/web_contents_impl_browsertest.cc

@@ -3221,7 +3221,7 @@ class LoadStateWaiter : public WebContentsDelegate {
 
 // TODO(csharrison,mmenke):  Beef up testing of LoadState a little. In
 // particular, check upload progress and check the LoadState param.
-IN_PROC_BROWSER_TEST_F(WebContentsImplBrowserTest, UpdateLoadState) {
+IN_PROC_BROWSER_TEST_F(WebContentsImplBrowserTest, DISABLED_UpdateLoadState) {
   base::string16 a_host = url_formatter::IDNToUnicode("a.com");
   base::string16 b_host = url_formatter::IDNToUnicode("b.com");
   base::string16 paused_host = url_formatter::IDNToUnicode("paused.com");