remove unnecessary string escapes (#50096)

dev/devicelab/bin/tasks/plugin_dependencies_test.dart

@@ -183,16 +183,16 @@ public class DummyPluginAClass {
       const String kExpectedPluginsDependenciesContent =
         '['
           '{'
-            '\"name\":\"plugin_a\",'
-            '\"dependencies\":[\"plugin_b\",\"plugin_c\"]'
+            '"name":"plugin_a",'
+            '"dependencies":["plugin_b","plugin_c"]'
           '},'
           '{'
-            '\"name\":\"plugin_b\",'
-            '\"dependencies\":[]'
+            '"name":"plugin_b",'
+            '"dependencies":[]'
           '},'
           '{'
-            '\"name\":\"plugin_c\",'
-            '\"dependencies\":[]'
+            '"name":"plugin_c",'
+            '"dependencies":[]'
           '}'
         ']';
       final String graphString = json.encode(dependencyGraph);

dev/devicelab/lib/framework/running_processes.dart

@@ -85,7 +85,7 @@ Stream<RunningProcessInfo> windowsRunningProcesses(String processName) async* {
   // a process.
   // See: https://docs.microsoft.com/en-us/windows/desktop/cimwin32prov/win32-process
   final String script = processName != null
-      ? '"Get-CimInstance Win32_Process -Filter \\\"name=\'$processName\'\\\" | Select-Object ProcessId,CreationDate,CommandLine | Format-Table -AutoSize | Out-String -Width 4096"'
+      ? '"Get-CimInstance Win32_Process -Filter \\"name=\'$processName\'\\" | Select-Object ProcessId,CreationDate,CommandLine | Format-Table -AutoSize | Out-String -Width 4096"'
       : '"Get-CimInstance Win32_Process | Select-Object ProcessId,CreationDate,CommandLine | Format-Table -AutoSize | Out-String -Width 4096"';
   // Unfortunately, there doesn't seem to be a good way to get ProcessManager to
   // run this. May be a bug in Dart.

examples/flutter_gallery/lib/demo/fortnightly/fortnightly.dart

@@ -76,7 +76,7 @@ class FruitPage extends StatelessWidget {
   static final String paragraph2 = '''Pomegranates on the other hand have become
  almost ubiquitous. You can find its juice in any bodega, Walmart, and even some
  gas stations. But at what cost? The pomegranate juice craze of the aughts made
- \"megafarmers\" Lynda and Stewart Resnick billions. Unfortunately, it takes a lot
+ "megafarmers" Lynda and Stewart Resnick billions. Unfortunately, it takes a lot
  of water to make that much pomegranate juice. Water the Resnicks get from their
  majority stake in the Kern Water Bank. How did one family come to hold control
  over water meant for the whole central valley of California? The story will shock you.

packages/flutter_tools/lib/src/project.dart

@@ -602,9 +602,9 @@ class AndroidProject extends FlutterProjectPlatform {
   @override
   String get pluginConfigKey => AndroidPlugin.kConfigKey;
 
-  static final RegExp _applicationIdPattern = RegExp('^\\s*applicationId\\s+[\'\"](.*)[\'\"]\\s*\$');
-  static final RegExp _kotlinPluginPattern = RegExp('^\\s*apply plugin\:\\s+[\'\"]kotlin-android[\'\"]\\s*\$');
-  static final RegExp _groupPattern = RegExp('^\\s*group\\s+[\'\"](.*)[\'\"]\\s*\$');
+  static final RegExp _applicationIdPattern = RegExp('^\\s*applicationId\\s+[\'"](.*)[\'"]\\s*\$');
+  static final RegExp _kotlinPluginPattern = RegExp('^\\s*apply plugin\:\\s+[\'"]kotlin-android[\'"]\\s*\$');
+  static final RegExp _groupPattern = RegExp('^\\s*group\\s+[\'"](.*)[\'"]\\s*\$');
 
   /// The Gradle root directory of the Android host app. This is the directory
   /// containing the `app/` subdirectory and the `settings.gradle` file that