Move a bunch of ash-only vector icons to ash/.

ash/common/system/chromeos/palette/tools/capture_region_mode.h

Index: ash/common/system/chromeos/palette/tools/capture_region_mode.h
diff --git a/ash/common/system/chromeos/palette/tools/capture_region_mode.h b/ash/common/system/chromeos/palette/tools/capture_region_mode.h
index fb9af50496e7262af42f5b056414c089403a4eda..d2cdc6a90f82cd8ef437e408e3d75129ebd06d8c 100644
--- a/ash/common/system/chromeos/palette/tools/capture_region_mode.h
+++ b/ash/common/system/chromeos/palette/tools/capture_region_mode.h
@@ -20,13 +20,13 @@ class ASH_EXPORT CaptureRegionMode : public CommonPaletteTool {
   // PaletteTool:
   PaletteGroup GetGroup() const override;
   PaletteToolId GetToolId() const override;
-  gfx::VectorIconId GetActiveTrayIcon() override;
+  const gfx::VectorIcon& GetActiveTrayIcon() const override;
   void OnEnable() override;
   void OnDisable() override;
   views::View* CreateView() override;
 
   // CommonPaletteTool:
-  gfx::VectorIconId GetPaletteIconId() override;
+  const gfx::VectorIcon& GetPaletteIcon() const override;
 
   void OnScreenshotDone();