Revert "[VM/Runtime] Cleanup package config initialization code"

This reverts commit 29e93bcdbd.

Reason for revert: Windows bots are failing with package resolution
errors. Looks like we are missing a windows path sanitization step.

Change-Id: Ib56f7e926b4f385fa3fde74c9c71947f64b8be1c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151469
Reviewed-by: Siva Annamalai <asiva@google.com>

runtime/include/dart_api.h

@@ -3332,17 +3332,6 @@ DART_EXPORT Dart_Port Dart_KernelPort();
  *
  * \param platform_kernel_size The length of the platform_kernel buffer.
  *
- * \param incremental_compile Specifies if incremental compilation is needed.
- *
- * \param package_config Uri of the package configuration file (either in format
- *   of .packages or .dart_tool/package_config.json) for the null safety
- *   detection to resolve package imports against. If this parameter is not
- *   passed the package resolution of the parent isolate should be used.
- *
- * \param original_working_directory current working directory when the VM
- *   process was launched, this is used to correctly resolve the path specified
- *   for package_config.
- *
  * \return Returns the result of the compilation.
  *
  * On a successful compilation the returned [Dart_KernelCompilationResult] has
@@ -3360,8 +3349,7 @@ Dart_CompileToKernel(const char* script_uri,
                      const uint8_t* platform_kernel,
                      const intptr_t platform_kernel_size,
                      bool incremental_compile,
-                     const char* package_config,
-                     const char* original_working_directory);
+                     const char* package_config);
 
 typedef struct {
   const char* uri;