Use rewriting to make ChromeOS keyboard F<number> keys produce extended keycodes.

chrome/browser/ui/ash/volume_controller_chromeos.cc

Index: chrome/browser/ui/ash/volume_controller_chromeos.cc
diff --git a/chrome/browser/ui/ash/volume_controller_chromeos.cc b/chrome/browser/ui/ash/volume_controller_chromeos.cc
index f44b8b401f592e7742453e565a31fa5951663c45..d90aa6062398b9dd3c10b22c1f06b10b2802977f 100644
--- a/chrome/browser/ui/ash/volume_controller_chromeos.cc
+++ b/chrome/browser/ui/ash/volume_controller_chromeos.cc
@@ -17,7 +17,7 @@ const double kStepPercentage = 4.0;
 }  // namespace
 
 bool VolumeController::HandleVolumeMute(const ui::Accelerator& accelerator) {
-  if (accelerator.key_code() == ui::VKEY_F8)
+  if (accelerator.key_code() == ui::VKEY_VOLUME_MUTE)
     content::RecordAction(content::UserMetricsAction("Accel_VolumeMute_F8"));
 
   chromeos::AudioHandler* audio_handler = chromeos::AudioHandler::GetInstance();
@@ -32,7 +32,7 @@ bool VolumeController::HandleVolumeMute(const ui::Accelerator& accelerator) {
 }
 
 bool VolumeController::HandleVolumeDown(const ui::Accelerator& accelerator) {
-  if (accelerator.key_code() == ui::VKEY_F9)
+  if (accelerator.key_code() == ui::VKEY_VOLUME_DOWN)
     content::RecordAction(content::UserMetricsAction("Accel_VolumeDown_F9"));
 
   chromeos::AudioHandler* audio_handler = chromeos::AudioHandler::GetInstance();
@@ -47,7 +47,7 @@ bool VolumeController::HandleVolumeDown(const ui::Accelerator& accelerator) {
 }
 
 bool VolumeController::HandleVolumeUp(const ui::Accelerator& accelerator) {
-  if (accelerator.key_code() == ui::VKEY_F10)
+  if (accelerator.key_code() == ui::VKEY_VOLUME_UP)
     content::RecordAction(content::UserMetricsAction("Accel_VolumeUp_F10"));
 
   chromeos::AudioHandler* audio_handler = chromeos::AudioHandler::GetInstance();