[Fullscreen Control] Roll the fullscreen exit UI to 100% on all channels

This CL unconditionally enables the fullscreen exit UI as we get all
approvals on the launch bug.

Bug: 829606
Change-Id: Ia8dd65b0946999d5cba9d897f068f4c9858ff163
Reviewed-on: https://chromium-review.googlesource.com/1073625Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562041}

chrome/browser/ui/views/fullscreen_control/fullscreen_control_host.cc

@@ -66,9 +66,7 @@ bool IsExitUiEnabled() {
   // menu and controls reveal when the cursor is moved to the top.
   return false;
 #else
-  return chrome::GetChannel() == version_info::Channel::CANARY ||
-         chrome::GetChannel() == version_info::Channel::DEV ||
-         base::FeatureList::IsEnabled(features::kFullscreenExitUI);
+  return base::FeatureList::IsEnabled(features::kFullscreenExitUI);
 #endif
 }
 

chrome/common/chrome_features.cc

@@ -271,7 +271,7 @@ const base::Feature kOpenVR{"OpenVR", base::FEATURE_DISABLED_BY_DEFAULT};
 // Enables a floating action button-like full screen exit UI to allow exiting
 // fullscreen using mouse or touch.
 const base::Feature kFullscreenExitUI{"FullscreenExitUI",
-                                      base::FEATURE_DISABLED_BY_DEFAULT};
+                                      base::FEATURE_ENABLED_BY_DEFAULT};
 
 #if defined(OS_WIN)
 // Enables using GDI to print text as simply text.