kUseMonitorColorSpace: mark DISABLED_BY_DEFAULT

Mark kUseMonitorColorSpace disabled by default to avoid
the blue-color-looks-purple problems detailed in the bug.
This is just a temporary CL to allow cherry-picking it
into the beta branch.

TBR=dcastagna@chromium.org

Bug: 809909
Change-Id: I35bb8cc48c26091cb1752d3d7709a48d23fb4c6e
Reviewed-on: https://chromium-review.googlesource.com/1012305Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551152}

ui/display/display_switches.cc

@@ -68,7 +68,7 @@ const base::Feature kHighDynamicRange{"HighDynamicRange",
 // Enables using the monitor's provided color space information when rendering.
 // TODO(mcasas): remove this flag http://crbug.com/771345.
 const base::Feature kUseMonitorColorSpace{"UseMonitorColorSpace",
-                                          base::FEATURE_ENABLED_BY_DEFAULT};
+                                          base::FEATURE_DISABLED_BY_DEFAULT};
 #endif
 
 }  // namespace features