Update strings for ash palette and rename options/settings files.

ash/common/system/chromeos/palette/tools/capture_region_action.cc

Index: ash/common/system/chromeos/palette/tools/capture_region_action.cc
diff --git a/ash/common/system/chromeos/palette/tools/capture_region_action.cc b/ash/common/system/chromeos/palette/tools/capture_region_action.cc
index 51a7c75890dc04ca260e28559ce24336375c9e2f..a8b4e2cabb6692e7b7bddcf430a55303aeb545a5 100644
--- a/ash/common/system/chromeos/palette/tools/capture_region_action.cc
+++ b/ash/common/system/chromeos/palette/tools/capture_region_action.cc
@@ -10,7 +10,6 @@
 #include "ash/common/system/toast/toast_data.h"
 #include "ash/common/system/toast/toast_manager.h"
 #include "ash/common/wm_shell.h"
-#include "base/strings/utf_string_conversions.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 
@@ -21,9 +20,6 @@ namespace {
 const char kToastId[] = "palette_capture_region";
 const int kToastDurationMs = 2500;
 
-// TODO(jdufault): Localize toast message. See crbug.com/634558.
-const char kToastMessage[] = "Select a region";
-
 }  // namespace
 
 CaptureRegionAction::CaptureRegionAction(Delegate* delegate)
@@ -42,8 +38,9 @@ PaletteToolId CaptureRegionAction::GetToolId() const {
 void CaptureRegionAction::OnEnable() {
   CommonPaletteTool::OnEnable();
 
-  ToastData toast(kToastId, base::ASCIIToUTF16(kToastMessage), kToastDurationMs,
-                  base::string16());
+  ToastData toast(
+      kToastId, l10n_util::GetStringUTF16(IDS_ASH_PALETTE_CAPTURE_REGION_TOAST),
+      kToastDurationMs, base::string16());
   ash::WmShell::Get()->toast_manager()->Show(toast);
 
   WmShell::Get()->palette_delegate()->TakePartialScreenshot();