Refactor: unsigned short -> uint16_t in third_party/blink/renderer/core/testing

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

Bug: 929986
Change-Id: I7ae64b98d2f4d76d9eaafde8c8c90effefbf9398
Reviewed-on: https://chromium-review.googlesource.com/c/1485695Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635083}

third_party/blink/renderer/core/testing/internals.cc

@@ -533,7 +533,7 @@ Node* Internals::parentTreeScope(Node* node) {
   return parent_tree_scope ? &parent_tree_scope->RootNode() : nullptr;
 }
 
-unsigned short Internals::compareTreeScopePosition(
+uint16_t Internals::compareTreeScopePosition(
     const Node* node1,
     const Node* node2,
     ExceptionState& exception_state) const {

third_party/blink/renderer/core/testing/internals.h

@@ -142,7 +142,7 @@ class Internals final : public ScriptWrappable {
   bool isValidContentSelect(Element* insertion_point, ExceptionState&);
   Node* treeScopeRootNode(Node*);
   Node* parentTreeScope(Node*);
-  unsigned short compareTreeScopePosition(const Node*,
+  uint16_t compareTreeScopePosition(const Node*,
                                     const Node*,
                                     ExceptionState&) const;
 

third_party/blink/renderer/core/testing/origin_trials_test.h

@@ -33,7 +33,7 @@ class OriginTrialsTest : public ScriptWrappable {
   static bool staticAttribute() { return true; }
   bool normalMethod() { return true; }
   static bool staticMethod() { return true; }
-  static const unsigned short kConstant = 1;
+  static const uint16_t kConstant = 1;
 
   bool throwingAttribute(ScriptState*, ExceptionState&);
   OriginTrialsTestDictionary* getDictionaryMethod() {
@@ -46,7 +46,7 @@ class OriginTrialsTest : public ScriptWrappable {
   bool unconditionalMethod() { return true; }
   void unconditionalDictionaryMethod(const OriginTrialsTestDictionary* dict) {}
   static bool staticUnconditionalMethod() { return true; }
-  static const unsigned short kUnconditionalConstant = 99;
+  static const uint16_t kUnconditionalConstant = 99;
 
   bool secureUnconditionalAttribute() { return true; }
   static bool secureStaticUnconditionalAttribute() { return true; }