Roll Observatory deps (charted -> ^0.3.0)

packages/dart_style/lib/src/line_splitting/line_splitter.dart

Index: packages/dart_style/lib/src/line_splitting/line_splitter.dart
diff --git a/packages/dart_style/lib/src/line_splitting/line_splitter.dart b/packages/dart_style/lib/src/line_splitting/line_splitter.dart
index f562ca40dc699dc45f96e404f1b4ae7c2b66d207..420c509fe381fe06e9ebdb49ab09a2440cf80022 100644
--- a/packages/dart_style/lib/src/line_splitting/line_splitter.dart
+++ b/packages/dart_style/lib/src/line_splitting/line_splitter.dart
@@ -130,10 +130,10 @@ class LineSplitter {
       int firstLineIndent,
       {bool flushLeft: false})
       : chunks = chunks,
-        // Collect the set of soft rules that we need to select values for.
+        // Collect the set of rules that we need to select values for.
         rules = chunks
             .map((chunk) => chunk.rule)
-            .where((rule) => rule != null && rule is! HardSplitRule)
+            .where((rule) => rule != null)
             .toSet()
             .toList(growable: false),
         blockIndentation = blockIndentation,
@@ -145,6 +145,12 @@ class LineSplitter {
     for (var i = 0; i < rules.length; i++) {
       rules[i].index = i;
     }
+
+    // Now that every used rule has an index, tell the rules to discard any
+    // constraints on unindexed rules.
+    for (var rule in rules) {
+      rule.forgetUnusedRules();
+    }
   }
 
   /// Determine the best way to split the chunks into lines that fit in the