Updating Gamepad API to match latest spec

content/browser/gamepad/gamepad_standard_mappings_linux.cc

Index: content/browser/gamepad/gamepad_standard_mappings_linux.cc
diff --git a/content/browser/gamepad/gamepad_standard_mappings_linux.cc b/content/browser/gamepad/gamepad_standard_mappings_linux.cc
index 08104dcd094fc61de61118fe83ec72a78938b405..86c3afde8a15399e136b0f8c5f8ea1a59d8ec515 100644
--- a/content/browser/gamepad/gamepad_standard_mappings_linux.cc
+++ b/content/browser/gamepad/gamepad_standard_mappings_linux.cc
@@ -4,24 +4,10 @@
 
 #include "content/browser/gamepad/gamepad_standard_mappings.h"
 
-#include "content/common/gamepad_hardware_buffer.h"
-
 namespace content {
 
 namespace {
 
-float AxisToButton(float input) {
-  return (input + 1.f) / 2.f;
-}
-
-float AxisNegativeAsButton(float input) {
-  return (input < -0.5f) ? 1.f : 0.f;
-}
-
-float AxisPositiveAsButton(float input) {
-  return (input > 0.5f) ? 1.f : 0.f;
-}
-
 void MapperXInputStyleGamepad(
     const blink::WebGamepad& input,
     blink::WebGamepad* mapped) {