[ios] Fixed SetPageDisplayStateWithUserScalableEnabled test for iOS 10.

Looks like maximum zoom scale on iOS10 is 5.0, which should be set
instead of 10.0.

BUG=626688

Review-Url: https://codereview.chromium.org/2134873002
Cr-Commit-Position: refs/heads/master@{#404518}

ios/web/web_state/ui/crw_web_controller_unittest.mm

@@ -757,7 +757,8 @@ TEST_F(CRWWebControllerPageScrollStateTest,
 // TODO(iOS): Flaky on the bots. crbug/493427
 TEST_F(CRWWebControllerPageScrollStateTest,
        FLAKY_SetPageDisplayStateWithUserScalableEnabled) {
-  web::PageZoomState zoom_state(1.0, 10.0, 1.0);
+  web::PageZoomState zoom_state(1.0, 5.0, 1.0);
+
   LoadHtml(GetHTMLForZoomState(zoom_state, PAGE_SCALABILITY_ENABLED));
   WaitForZoomRendering(web_controller(), zoom_state);
 
@@ -767,7 +768,7 @@ TEST_F(CRWWebControllerPageScrollStateTest,
       CreateTestPageDisplayState(CGPointMake(1.0, 1.0),  // scroll offset
                                  3.0,                    // relative zoom scale
                                  1.0,    // original minimum zoom scale
-                                 10.0,   // original maximum zoom scale
+                                 5.0,    // original maximum zoom scale
                                  1.0));  // original zoom scale
   [web_controller() restoreStateFromHistory];