Fabric: Remove const qualifier from all fields of ViewProps and Props

Summary:
This is a part of migration staterted in D19390813.
There is no need to have those as `const`. The whole `*Props` object is usually `const` (and when it's not, props should not be too).

Changelog: [Internal] Fabric-specific internal change.

Reviewed By: mdvacca

Differential Revision: D19583582

fbshipit-source-id: 9c680268f944cdf08669fce7e997b05f23a02667

ReactCommon/fabric/components/view/ViewProps.h

@@ -34,33 +34,33 @@ class ViewProps : public Props,
 #pragma mark - Props
 
   // Color
-  Float const opacity{1.0};
-  SharedColor const foregroundColor{};
-  SharedColor const backgroundColor{};
+  Float opacity{1.0};
+  SharedColor foregroundColor{};
+  SharedColor backgroundColor{};
 
   // Borders
-  CascadedBorderRadii const borderRadii{};
-  CascadedBorderColors const borderColors{};
-  CascadedBorderStyles const borderStyles{};
+  CascadedBorderRadii borderRadii{};
+  CascadedBorderColors borderColors{};
+  CascadedBorderStyles borderStyles{};
 
   // Shadow
-  SharedColor const shadowColor{};
-  Size const shadowOffset{};
-  Float const shadowOpacity{};
-  Float const shadowRadius{};
+  SharedColor shadowColor{};
+  Size shadowOffset{};
+  Float shadowOpacity{};
+  Float shadowRadius{};
 
   // Transform
   Transform transform{};
-  BackfaceVisibility const backfaceVisibility{};
-  bool const shouldRasterize{};
-  int const zIndex{};
+  BackfaceVisibility backfaceVisibility{};
+  bool shouldRasterize{};
+  int zIndex{};
 
   // Events
-  PointerEventsMode const pointerEvents{};
-  EdgeInsets const hitSlop{};
-  bool const onLayout{};
+  PointerEventsMode pointerEvents{};
+  EdgeInsets hitSlop{};
+  bool onLayout{};
 
-  bool const collapsable{true};
+  bool collapsable{true};
 
 #pragma mark - Convenience Methods
 

ReactCommon/fabric/core/shadownode/Props.h

@@ -31,7 +31,7 @@ class Props : public virtual Sealable, public virtual DebugStringConvertible {
   Props(Props const &sourceProps, RawProps const &rawProps);
   virtual ~Props() = default;
 
-  std::string const nativeId;
+  std::string nativeId;
 
   /*
    * Special value that represents generation number of `Props` object, which

ReactCommon/fabric/element/tests/ElementTest.cpp

@@ -33,8 +33,8 @@ TEST(ElementTest, testNormalCases) {
   auto shadowNodeAB = std::shared_ptr<ViewShadowNode const>{};
   auto shadowNodeABA = std::shared_ptr<ViewShadowNode const>{};
 
-  auto propsAA = std::make_shared<ViewProps const>();
-  const_cast<std::string &>(propsAA->nativeId) = "node AA";
+  auto propsAA = std::make_shared<ViewProps>();
+  propsAA->nativeId = "node AA";
 
   // clang-format off
   auto element =
@@ -42,9 +42,9 @@ TEST(ElementTest, testNormalCases) {
         .reference(shadowNodeA)
         .tag(1)
         .props([]() {
-          auto props = std::make_shared<ViewProps const>();
-          const_cast<int &>(props->zIndex) = 42;
-          const_cast<std::string &>(props->nativeId) = "node A";
+          auto props = std::make_shared<ViewProps>();
+          props->zIndex = 42;
+          props->nativeId = "node A";
           return props;
         })
         .finalize([](ViewShadowNode &shadowNode){
@@ -59,8 +59,8 @@ TEST(ElementTest, testNormalCases) {
             .reference(shadowNodeAB)
             .tag(3)
             .props([]() {
-               auto props = std::make_shared<ViewProps const>();
-               const_cast<std::string &>(props->nativeId) = "node AB";
+               auto props = std::make_shared<ViewProps>();
+               props->nativeId = "node AB";
                return props;
             })
             .children({
@@ -68,8 +68,8 @@ TEST(ElementTest, testNormalCases) {
                 .reference(shadowNodeABA)
                 .tag(4)
                 .props([]() {
-                  auto props = std::make_shared<ViewProps const>();
-                  const_cast<std::string &>(props->nativeId) = "node ABA";
+                  auto props = std::make_shared<ViewProps>();
+                  props->nativeId = "node ABA";
                   return props;
                 })
             })