[js_runtime/js_dev_runtime] Don't consider running on Windows when compiled for web

This bool is used to check if certain Uri functions should default to Windows behavior on Node. If running on the web, these checks will always be false though, so add a check to enable tree shaking to remove unused Windows functionality.

Fixes #54474

Change-Id: I1ef830f7b14af928a16a875d50cf6ab0db727dfc
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/345100
Reviewed-by: Sigmund Cherem <[email protected]>
Reviewed-by: Nate Bosch <[email protected]>
Reviewed-by: Mayank Patke <[email protected]>
Commit-Queue: Mayank Patke <[email protected]>
Auto-Submit: Parker Lougheed <[email protected]>

Author: parlough

sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart

@@ -884,14 +884,9 @@ class Uri {
 
 @patch
 class _Uri {
+  // DDC is only used when targeting the browser, so this is always false.
   @patch
-  static bool get _isWindows => _isWindowsCached;
-
-  static final bool _isWindowsCached = JS(
-      'bool',
-      'typeof process != "undefined" && '
-          'Object.prototype.toString.call(process) == "[object process]" && '
-          'process.platform == "win32"');
+  static bool get _isWindows => false;
 
   // Matches a String that _uriEncodes to itself regardless of the kind of
   // component.  This corresponds to [_unreservedTable], i.e. characters that

sdk/lib/_internal/js_runtime/lib/core_patch.dart

@@ -822,11 +822,16 @@ class _Uri {
   @patch
   static bool get _isWindows => _isWindowsCached;
 
-  static final bool _isWindowsCached = JS(
-      'bool',
-      'typeof process != "undefined" && '
-          'Object.prototype.toString.call(process) == "[object process]" && '
-          'process.platform == "win32"');
+  // Consider the possibility of using Windows behavior if app is
+  // compiled with `--server-mode` and running on Node or a similar platform.
+  static final bool _isWindowsCached =
+      !const bool.fromEnvironment('dart.library.html') &&
+          JS<bool>(
+            'bool',
+            'typeof process != "undefined" && '
+                'Object.prototype.toString.call(process) == "[object process]" && '
+                'process.platform == "win32"',
+          );
 
   // Matches a String that _uriEncodes to itself regardless of the kind of
   // component.  This corresponds to [_unreservedTable], i.e. characters that