style(dart): Run dartfmt v0.1.8+2 on all pure Dart code

Update formatting for all pure Dart code in the repo.

modules/benchpress/index.dart

@@ -1,2 +1,3 @@
 library benchpress.index;
+
 //no dart implementation

modules/benchpress/src/firefox_extension/data/installed_script.dart

@@ -1,2 +1,3 @@
 library benchpress.src.firefox_extension.data.installed_script;
+
 //no dart implementation

modules/benchpress/src/firefox_extension/lib/main.dart

@@ -1,2 +1,3 @@
 library benchpress.src.firefox_extension.lib.main;
+
 //no dart implementation

modules/benchpress/src/firefox_extension/lib/parser_util.dart

@@ -1,2 +1,3 @@
 library benchpress.src.firefox_extension.lib.parser_util;
+
 //no dart implementation

modules/benchpress/src/firefox_extension/lib/test_helper.dart

@@ -1,2 +1,3 @@
 library benchpress.src.firefox_extension.lib.test_helper;
+
 //no dart implementation

modules/benchpress/src/webdriver/selenium_webdriver_adapter.dart

@@ -1,2 +1,3 @@
 library benchpress.src.webdriver.selenium_webdriver_adapter;
+
 //no dart implementation

modules/benchpress/test/firefox_extension/conf.dart

@@ -1,2 +1,3 @@
 library benchpress.test.firefox_extension.conf;
+
 //empty as we don't have a version for dart

modules/benchpress/test/firefox_extension/parser_util_spec.dart

@@ -1,5 +1,3 @@
 library benchpress.test.firefox_extension.parser_util_spec;
 
-main() {
-
-}
+main() {}

modules/benchpress/test/firefox_extension/sample_benchmark.dart

@@ -1,5 +1,3 @@
 library benchpress.test.firefox_extension.sample_benchmark;
 
-main() {
-
-}
+main() {}

modules/benchpress/test/firefox_extension/spec.dart

@@ -1,5 +1,3 @@
 library benchpress.test.firefox_extension.spec;
 
-main() {
-
-}
+main() {}