Cherry pick [Android] When toggling AX script inject, also set native AX state.

Cherry pick of https://codereview.chromium.org/24559002/

Bug: 10911684

Original description:
[Android] When toggling AX script inject, also set native AX state.
When we enable/disable script injection, also update the flag that
says whether we should use native accessibility.

Change-Id: I6ff2ee7cb0309ec0f279178245056a6de3df560c

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

@@ -2900,15 +2900,12 @@ import java.util.Map;
     public void setAccessibilityState(boolean state) {
         if (!state) {
             setInjectedAccessibility(false);
-            return;
-        }
-
-        if (isDeviceAccessibilityScriptInjectionEnabled()) {
-            setInjectedAccessibility(true);
-            return;
+            mNativeAccessibilityAllowed = false;
+        } else {
+            boolean useScriptInjection = isDeviceAccessibilityScriptInjectionEnabled();
+            setInjectedAccessibility(useScriptInjection);
+            mNativeAccessibilityAllowed = !useScriptInjection;
         }
-
-        mNativeAccessibilityAllowed = true;
     }
 
     /**