Removes trailing whitespace from source files. (#19329)

packages/flutter_tools/lib/src/android/android_sdk.dart

diff --git a/packages/flutter_tools/lib/src/android/android_sdk.dart b/packages/flutter_tools/lib/src/android/android_sdk.dart
index d547cef..0726a6f 100644
--- a/packages/flutter_tools/lib/src/android/android_sdk.dart
+++ b/packages/flutter_tools/lib/src/android/android_sdk.dart
@@ -70,7 +70,7 @@
 
 /// Locate the path for storing AVD emulator images. Returns null if none found.
 String getAvdPath() {
-  
+
   final List<String> searchPaths = <String>[
     platform.environment['ANDROID_AVD_HOME']
   ];