Refactor: unsigned short -> uint16_t in third_party/blink/*.tmpl

- unsigned short -> uint16_t.
- No logic changes.
- Reference: https://google.github.io/styleguide/cppguide.html#Integer_Types

Bug: 929986
Change-Id: I420583fd54e02d301839363aee97bcf1efa9097a
Reviewed-on: https://chromium-review.googlesource.com/c/1496403Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636783}

third_party/blink/renderer/build/scripts/core/css/templates/css_value_keywords.cc.tmpl

@@ -22,7 +22,7 @@ static const char valueListStringPool[] = {
 {% endfor %}
 };
 
-static const unsigned short valueListStringOffsets[] = {
+static const uint16_t valueListStringOffsets[] = {
 {% for offset in value_keyword_offsets %}
   {{offset}},
 {% endfor %}
@@ -58,7 +58,7 @@ const char* getValueName(CSSValueID id) {
   return valueListStringPool + valueListStringOffsets[id - 1];
 }
 
-bool isValueAllowedInMode(unsigned short id, CSSParserMode mode) {
+bool isValueAllowedInMode(uint16_t id, CSSParserMode mode) {
   switch (id) {
 {% for ua_keyword in ua_sheet_mode_values_keywords %}
     case {{ua_keyword.enum_name}}:

third_party/blink/renderer/build/scripts/core/css/templates/css_value_keywords.h.tmpl

@@ -6,6 +6,7 @@
 #define {{header_guard}}
 
 #include <string.h>
+#include <stdint.h>
 
 #include "third_party/blink/renderer/core/css/parser/css_parser_mode.h"
 
@@ -22,7 +23,7 @@ const int numCSSValueKeywords = {{value_keywords_count}};
 const size_t maxCSSValueKeywordLength = {{max_value_keyword_length}};
 
 const char* getValueName(CSSValueID);
-bool isValueAllowedInMode(unsigned short id, CSSParserMode mode);
+bool isValueAllowedInMode(uint16_t id, CSSParserMode mode);
 
 }  // namespace blink
 

third_party/blink/renderer/build/scripts/core/style/templates/computed_style_initial_values.h.tmpl

@@ -45,7 +45,7 @@ class ComputedStyleInitialValues{
   }
   static StyleImage* InitialBorderImageSource() { return nullptr; }
   static float InitialBorderWidth() { return 3; }
-  static unsigned short InitialColumnRuleWidth() {
+  static uint16_t InitialColumnRuleWidth() {
     return 3;
   }
 
@@ -60,7 +60,7 @@ class ComputedStyleInitialValues{
   static float InitialWordSpacing() { return 0.0f; }
   static float InitialLetterSpacing() { return 0.0f; }
 
-  static unsigned short InitialOutlineWidth() {
+  static uint16_t InitialOutlineWidth() {
     return 3;
   }
   static EVerticalAlign InitialVerticalAlign() {