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

ash/common/system/chromeos/palette/palette_tool.h

Index: ash/common/system/chromeos/palette/palette_tool.h
diff --git a/ash/common/system/chromeos/palette/palette_tool.h b/ash/common/system/chromeos/palette/palette_tool.h
index eaa5ff8821089db6cd745a0ec4781bb005aec9c4..bc7c2c2d703c44b73f12fec732af5db634f087ed 100644
--- a/ash/common/system/chromeos/palette/palette_tool.h
+++ b/ash/common/system/chromeos/palette/palette_tool.h
@@ -14,6 +14,10 @@
 #include "base/macros.h"
 #include "ui/gfx/vector_icon_types.h"
 
+namespace gfx {
+struct VectorIcon;
+}
+
 namespace views {
 class View;
 }
@@ -84,7 +88,7 @@ class ASH_EXPORT PaletteTool {
 
   // Returns an icon to use in the tray if this tool is active. Only one tool
   // (per-group) should ever have an active icon at any given time.
-  virtual gfx::VectorIconId GetActiveTrayIcon();
+  virtual const gfx::VectorIcon& GetActiveTrayIcon() const;
 
  protected:
   // Enables/disables the tool.