Android: Remove the prompt when entering fullscreen mode (behind flag).

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index b06ac05aed1284ae1ed5d9fbe099dea53700fb76..2e4e4e50f64533dd7d040c25042d9783a0393627 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -105,10 +105,6 @@
 #include "ui/ozone/public/ozone_switches.h"
 #endif
 
-#if defined(TOOLKIT_VIEWS)
-#include "chrome/browser/ui/exclusive_access/exclusive_access_manager.h"
-#endif
-
 using flags_ui::FeatureEntry;
 using flags_ui::kOsMac;
 using flags_ui::kOsWin;
@@ -1625,11 +1621,9 @@ const FeatureEntry kFeatureEntries[] = {
      IDS_FLAGS_NEW_TASK_MANAGER_DESCRIPTION, kOsDesktop,
      SINGLE_DISABLE_VALUE_TYPE(switches::kDisableNewTaskManager)},
 #endif  // defined(ENABLE_TASK_MANAGER)
-#if defined(TOOLKIT_VIEWS)
     {"simplified-fullscreen-ui", IDS_FLAGS_SIMPLIFIED_FULLSCREEN_UI_NAME,

[jochen (gone - plz use gerrit), 2016/03/04 12:54:38]

does this require an update to histograms.xml now that this flag is available
everywhere?

[Matt Giuca, 2016/03/04 23:00:28]

No, it doesn't look like histograms.xml has anything about what operating
systems a particular flag supports. (Unless you see something I missed?)

-     IDS_FLAGS_SIMPLIFIED_FULLSCREEN_UI_DESCRIPTION, kOsDesktop,
-     FEATURE_VALUE_TYPE(ExclusiveAccessManager::kSimplifiedUIFeature)},
-#endif  // defined(TOOLKIT_VIEWS)
+     IDS_FLAGS_SIMPLIFIED_FULLSCREEN_UI_DESCRIPTION, kOsAll,
+     FEATURE_VALUE_TYPE(features::kSimplifiedFullscreenUI)},
 #if defined(OS_ANDROID)
     {"progress-bar-animation", IDS_FLAGS_PROGRESS_BAR_ANIMATION_NAME,
      IDS_FLAGS_PROGRESS_BAR_ANIMATION_DESCRIPTION, kOsAndroid,