child user: Enable DMServerOAuthForChildUser by default

Bug: 839025
Change-Id: I19967724efab49c6ae3b27bac0676a9e9aeebc74
Reviewed-on: https://chromium-review.googlesource.com/c/1449314Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634517}

chrome/common/chrome_features.cc

@@ -146,7 +146,7 @@ const base::Feature kChangePictureVideoMode{"ChangePictureVideoMode",
 // Enables passing additional user authentication in requests to DMServer
 // (policy fetch, status report upload).
 const base::Feature kDMServerOAuthForChildUser{
-    "DMServerOAuthForChildUser", base::FEATURE_DISABLED_BY_DEFAULT};
+    "DMServerOAuthForChildUser", base::FEATURE_ENABLED_BY_DEFAULT};
 #endif
 
 #if defined(OS_ANDROID)