ui: Enable HDR by default on Chromebooks

This CL flips the FeatureFlag to be enabled by default.

Bug: 958166
Change-Id: I75edaccca252c3bcb87d8550b6b6350348000022
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317569Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791821}

ui/display/display_features.cc

@@ -10,7 +10,7 @@ namespace features {
 #if defined(OS_CHROMEOS)
 // Enables using HDR transfer function if the monitor says it supports it.
 const base::Feature kUseHDRTransferFunction{"UseHDRTransferFunction",
-                                            base::FEATURE_DISABLED_BY_DEFAULT};
+                                            base::FEATURE_ENABLED_BY_DEFAULT};
 #endif
 
 // This features allows listing all display modes of external displays in the