[ios] Disable failing WebViewKvoTest on iOS12.

Bug: 851472
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ia2adc8be4d6b007eff22acac225c1f6c4952334a
Reviewed-on: https://chromium-review.googlesource.com/1099882Reviewed-by: John Wu <jzw@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567065}

ios/web_view/test/web_view_kvo_inttest.mm

@@ -5,6 +5,7 @@
 #import <ChromeWebView/ChromeWebView.h>
 #import <Foundation/Foundation.h>
 
+#include "base/ios/ios_util.h"
 #include "base/strings/stringprintf.h"
 #import "base/strings/sys_string_conversions.h"
 #import "ios/testing/wait_util.h"
@@ -27,6 +28,10 @@ typedef ios_web_view::WebViewIntTest WebViewKvoTest;
 
 // Tests that CWVWebView correctly reports |canGoBack| and |canGoForward| state.
 TEST_F(WebViewKvoTest, CanGoBackForward) {
+  // TODO(crbug.com/851472): WebViewKvoTest tests failing on iOS12.
+  if (base::ios::IsRunningOnIOS12OrLater())
+    return;
+
   Observer* back_observer = [[Observer alloc] init];
   [back_observer setObservedObject:web_view_ keyPath:@"canGoBack"];
 
@@ -85,6 +90,10 @@ TEST_F(WebViewKvoTest, CanGoBackForward) {
 
 // Tests that CWVWebView correctly reports current |title|.
 TEST_F(WebViewKvoTest, Title) {
+  // TODO(crbug.com/851472): WebViewKvoTest tests failing on iOS12.
+  if (base::ios::IsRunningOnIOS12OrLater())
+    return;
+
   Observer* observer = [[Observer alloc] init];
   [observer setObservedObject:web_view_ keyPath:@"title"];
 
@@ -114,6 +123,10 @@ TEST_F(WebViewKvoTest, Title) {
 
 // Tests that CWVWebView correctly reports |isLoading| value.
 TEST_F(WebViewKvoTest, Loading) {
+  // TODO(crbug.com/851472): WebViewKvoTest tests failing on iOS12.
+  if (base::ios::IsRunningOnIOS12OrLater())
+    return;
+
   Observer* observer = [[Observer alloc] init];
   [observer setObservedObject:web_view_ keyPath:@"loading"];
 
@@ -142,6 +155,10 @@ TEST_F(WebViewKvoTest, Loading) {
 
 // Tests that CWVWebView correctly reports |visibleURL| and |lastCommittedURL|.
 TEST_F(WebViewKvoTest, URLs) {
+  // TODO(crbug.com/851472): WebViewKvoTest tests failing on iOS12.
+  if (base::ios::IsRunningOnIOS12OrLater())
+    return;
+
   Observer* last_committed_url_observer = [[Observer alloc] init];
   [last_committed_url_observer setObservedObject:web_view_
                                          keyPath:@"lastCommittedURL"];