Enable experiment AllowReaderForAccessibility by default

Bug: 777962
Change-Id: I6cf85600830ddd6c2398a15e4a1c4c74aa9fbfd9
Reviewed-on: https://chromium-review.googlesource.com/886830Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532390}

chrome/browser/android/chrome_feature_list.cc

@@ -164,7 +164,7 @@ const base::Feature kAdjustWebApkInstallationSpace = {
     "AdjustWebApkInstallationSpace", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kAllowReaderForAccessibility = {
-    "AllowReaderForAccessibility", base::FEATURE_DISABLED_BY_DEFAULT};
+    "AllowReaderForAccessibility", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kAndroidPayIntegrationV1{"AndroidPayIntegrationV1",
                                              base::FEATURE_ENABLED_BY_DEFAULT};