Clean up ComputedStyle field templates.

third_party/WebKit/Source/build/scripts/templates/fields/base.tmpl

-{% from 'fields/field.tmpl' import encode, decode, return_type, argument_type %}
-{% macro decl_public_methods(field) -%}
-inline static {{return_type(field)}} {{field.initial_method_name}}() {
+{% from 'fields/field.tmpl' import encode, decode, const_ref, nonconst_ref %}
+
+{% macro decl_initial_method(field) -%}
+inline static {{field.type_name}} {{field.initial_method_name}}() {
   return {{field.default_value}};
 }
-{{return_type(field)}} {{field.getter_method_name}}() const {
+{%- endmacro %}
+
+{% macro decl_getter_method(field) -%}
+{{const_ref(field)}} {{field.getter_method_name}}() const {
   return {{decode(field, field.name)}};
 }
-void {{field.setter_method_name}}({{argument_type(field)}} v) {
+{%- endmacro %}
+
+{% macro decl_setter_method(field) -%}
+void {{field.setter_method_name}}({{const_ref(field)}} v) {
   {{field.name}} = {{encode(field, "v")}};
 }
+{%- endmacro %}
+
+{% macro decl_resetter_method(field) -%}
 inline void {{field.resetter_method_name}}() {
   {{field.name}} = {{encode(field, field.default_value)}};
 }
 {%- endmacro %}
 
-{% macro decl_protected_methods(field) -%}
-{{return_type(field)}} {{field.internal_getter_method_name}}() const {
+{% macro decl_mutable_method(field) -%}
+{{nonconst_ref(field)}} {{field.mutable_method_name}}() const {
   return {{decode(field, field.name)}};
 }
-void {{field.internal_setter_method_name}}({{argument_type(field)}} v) {
+{%- endmacro %}
+
+{% macro decl_internal_getter_method(field) -%}
+{{const_ref(field)}} {{field.internal_getter_method_name}}() const {
+  return {{decode(field, field.name)}};
+}
+{%- endmacro %}
+
+{% macro decl_internal_setter_method(field) -%}
+void {{field.internal_setter_method_name}}({{const_ref(field)}} v) {
   {{field.name}} = {{encode(field, "v")}};
 }
 {%- endmacro %}