Vulkan: Remove unicode character from error string.

src/libANGLE/renderer/vulkan/vk_helpers.cpp

@@ -3090,7 +3090,7 @@ void ImageHelper::stageSubresourceUpdateFromImage(ImageHelper *image,
     {
         // These values must be set explicitly to follow the Vulkan spec:
         // https://www.khronos.org/registry/vulkan/specs/1.1-extensions/man/html/VkImageCopy.html
-        // If either of the calling command’s srcImage or dstImage parameters are of VkImageType
+        // If either of the calling command's srcImage or dstImage parameters are of VkImageType
         // VK_IMAGE_TYPE_3D, the baseArrayLayer and layerCount members of the corresponding
         // subresource must be 0 and 1, respectively
         copyToImage.dstSubresource.baseArrayLayer = 0;

src/libANGLE/renderer/vulkan/vk_utils.cpp

@@ -241,7 +241,7 @@ const char *VulkanResultString(VkResult result)
         case VK_ERROR_OUT_OF_POOL_MEMORY:
             return "A pool memory allocation has failed";
         case VK_ERROR_FRAGMENTED_POOL:
-            return "A pool allocation has failed due to fragmentation of the pool’s memory";
+            return "A pool allocation has failed due to fragmentation of the pool's memory";
         case VK_ERROR_INVALID_EXTERNAL_HANDLE:
             return "An external handle is not a valid handle of the specified type";
         default: