[dart2js_runtime_metrics] Update pubspec to 3.7 and reformat.

Change-Id: Ia1e81df8120f02d5d26297a84ef1e5e8f110d040
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/400740
Reviewed-by: Nate Biggs <[email protected]>
Auto-Submit: Mayank Patke <[email protected]>
Commit-Queue: Nate Biggs <[email protected]>

Author: fishythefish

pkg/dart2js_runtime_metrics/pubspec.yaml

@@ -7,9 +7,7 @@ description: >-
   This library provides access to the measurements at runtime.
 
 environment:
-  # Restrict the upper bound so that we can remove support for this in
-  # a later version of the SDK without it being a breaking change.
-  sdk: ">=2.14.0 <2.15.0"
+  sdk: "^3.7.0-0"
 
 # Use 'any' constraints here; we get our versions from the DEPS file.
 dev_dependencies:

pkg/dart2js_runtime_metrics/test/runtime_metrics_test.dart

@@ -27,8 +27,11 @@ void main() {
   }
 
   Expect.isTrue(metrics.containsKey('runtime'), "Has 'runtime' key: $metrics");
-  Expect.equals(expectedRuntime, metrics['runtime'],
-      "Expected 'runtime: $expectedRuntime': $metrics");
+  Expect.equals(
+    expectedRuntime,
+    metrics['runtime'],
+    "Expected 'runtime: $expectedRuntime': $metrics",
+  );
 
   if (expectedRuntime == 'dart2js') {
     Expect.isTrue(metrics.containsKey('allocations'));

pkg/dart2js_runtime_metrics/test/startup_metrics_test.dart

@@ -27,8 +27,11 @@ void main() {
   }
 
   Expect.isTrue(metrics.containsKey('runtime'), "Has 'runtime' key: $metrics");
-  Expect.equals(expectedRuntime, metrics['runtime'],
-      "Expected 'runtime: $expectedRuntime': $metrics");
+  Expect.equals(
+    expectedRuntime,
+    metrics['runtime'],
+    "Expected 'runtime: $expectedRuntime': $metrics",
+  );
 
   if (expectedRuntime == 'dart2js') {
     Expect.isTrue(metrics.containsKey('callMainMs'));