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

chrome/common/chrome_features.cc

Index: chrome/common/chrome_features.cc
diff --git a/chrome/common/chrome_features.cc b/chrome/common/chrome_features.cc
index 418e283f57c6f67ac6e4d6dda49d4a8ce43ab12a..a3787180e8e2a569460279a09df2c2b9ce9831c6 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -29,4 +29,18 @@ const base::Feature kRuntimeMemoryLeakDetector{
     "RuntimeMemoryLeakDetector", base::FEATURE_DISABLED_BY_DEFAULT};
 #endif  // defined(OS_CHROMEOS)
 
+// A new user experience for transitioning into fullscreen and mouse pointer
+// lock states. The name is a misnomer (for historical reasons); affects both
+// Views and Android builds.
+const base::Feature kSimplifiedFullscreenUI{
+    "ViewsSimplifiedFullscreenUI",
+#if defined(USE_AURA)
+    // Windows, Linux, Chrome OS.
+    base::FEATURE_ENABLED_BY_DEFAULT,
+#else
+    // Mac, Android.
+    base::FEATURE_DISABLED_BY_DEFAULT,
+#endif
+};
+
 }  // namespace features