Mark PortForwardingTest.LoadPageWithStyleAnsScript as flaky

BUG=477696
NOTRY=true
NOTREECHECKS=true
TBR=kaznacheev@chromium.org

Review URL: https://codereview.chromium.org/1084403003

Cr-Commit-Position: refs/heads/master@{#325444}

chrome/browser/devtools/device/port_forwarding_browsertest.cc

@@ -72,8 +72,9 @@ class PortForwardingTest: public InProcessBrowserTest {
   };
 };
 
+// Flaky on all platforms. https://crbug.com/477696
 IN_PROC_BROWSER_TEST_F(PortForwardingTest,
-                       LoadPageWithStyleAnsScript) {
+                       DISABLED_LoadPageWithStyleAnsScript) {
   Profile* profile = browser()->profile();
 
   AndroidDeviceManager::DeviceProviders device_providers;