Move Ash-specific vector icons to ash/common/resources

ash/resources/vector_icons/vector_icons.h.template

Index: ash/resources/vector_icons/vector_icons.h.template
diff --git a/ash/resources/vector_icons/vector_icons.h.template b/ash/resources/vector_icons/vector_icons.h.template
new file mode 100644
index 0000000000000000000000000000000000000000..a8473475133a2446cff7afbdee26ecb8d21872f6
--- /dev/null
+++ b/ash/resources/vector_icons/vector_icons.h.template
@@ -0,0 +1,24 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// vector_icons.h.template is used to generate vector_icons.h. Edit the former
+// rather than the latter.
+
+#ifndef ASH_RESOURCES_VECTOR_ICONS_VECTOR_ICONS_H_
+#define ASH_RESOURCES_VECTOR_ICONS_VECTOR_ICONS_H_
+
+namespace gfx {
+struct VectorIcon;
+}
+
+#define VECTOR_ICON_TEMPLATE_H(icon_name) \
+extern const gfx::VectorIcon icon_name;
+
+namespace ash {
+
+TEMPLATE_PLACEHOLDER
+
+}  // namespace ash
+
+#endif  // ASH_RESOURCES_VECTOR_ICONS_VECTOR_ICONS_H_