Change List/Set/Map/Queue.from constructrs to accept any iterable.

sdk/lib/core/map.dart

Index: sdk/lib/core/map.dart
diff --git a/sdk/lib/core/map.dart b/sdk/lib/core/map.dart
index 81f94f04f7066f639e6af8d2c59dec2ee346cef6..c011a2044a5ade009120ebda2ec5379815b91210 100644
--- a/sdk/lib/core/map.dart
+++ b/sdk/lib/core/map.dart
@@ -41,11 +41,14 @@ abstract class Map<K, V> {
    * Creates a [LinkedHashMap] instance that contains all key-value pairs of
    * [other].
    *
+   * The keys must all be assignable to [K] and the values to [V].
+   * The [other] map itself can have any type.
+   *
    * A `LinkedHashMap` requires the keys to implement compatible
    * `operator==` and `hashCode`, and it allows null as a key.
    * It iterates in key insertion order.
    */
-  factory Map.from(Map<K, V> other) = LinkedHashMap<K, V>.from;
+  factory Map.from(Map other) = LinkedHashMap<K, V>.from;
 
   /**
    * Creates an identity map with the default implementation, [LinkedHashMap].