Revert "Fix the newline on some keyboards (flutter#16560)"

This reverts commit 98b9ff8.

Author: NoamDev

shell/platform/android/BUILD.gn

@@ -435,12 +435,10 @@ action("robolectric_tests") {
     "test/io/flutter/embedding/engine/systemchannels/PlatformChannelTest.java",
     "test/io/flutter/external/FlutterLaunchTests.java",
     "test/io/flutter/plugin/common/StandardMessageCodecTest.java",
-    "test/io/flutter/plugin/editing/InputConnectionAdaptorTest.java",
     "test/io/flutter/plugin/editing/TextInputPluginTest.java",
     "test/io/flutter/plugin/platform/PlatformPluginTest.java",
     "test/io/flutter/plugin/platform/SingleViewPresentationTest.java",
     "test/io/flutter/plugins/GeneratedPluginRegistrant.java",
-    "test/io/flutter/util/FakeKeyEvent.java",
     "test/io/flutter/util/PreconditionsTest.java",
   ]
 

shell/platform/android/io/flutter/plugin/editing/InputConnectionAdaptor.java

@@ -10,7 +10,6 @@
 import android.provider.Settings;
 import android.text.DynamicLayout;
 import android.text.Editable;
-import android.text.InputType;
 import android.text.Layout;
 import android.text.Selection;
 import android.text.TextPaint;
@@ -275,11 +274,8 @@ public boolean sendKeyEvent(KeyEvent event) {
         int newSel = Math.min(selStart + 1, mEditable.length());
         setSelection(newSel, newSel);
         return true;
-        // When the enter key is pressed on a non-multiline field, consider it a
-        // submit instead of a newline.
-      } else if ((event.getKeyCode() == KeyEvent.KEYCODE_ENTER
-              || event.getKeyCode() == KeyEvent.KEYCODE_NUMPAD_ENTER)
-          && (InputType.TYPE_TEXT_FLAG_MULTI_LINE & mEditorInfo.inputType) == 0) {
+      } else if (event.getKeyCode() == KeyEvent.KEYCODE_ENTER
+          || event.getKeyCode() == KeyEvent.KEYCODE_NUMPAD_ENTER) {
         performEditorAction(mEditorInfo.imeOptions & EditorInfo.IME_MASK_ACTION);
         return true;
       } else {

shell/platform/android/test/io/flutter/FlutterTestSuite.java

@@ -17,7 +17,6 @@
 import io.flutter.embedding.engine.systemchannels.PlatformChannelTest;
 import io.flutter.external.FlutterLaunchTests;
 import io.flutter.plugin.common.StandardMessageCodecTest;
-import io.flutter.plugin.editing.InputConnectionAdaptorTest;
 import io.flutter.plugin.editing.TextInputPluginTest;
 import io.flutter.plugin.platform.PlatformPluginTest;
 import io.flutter.plugin.platform.SingleViewPresentationTest;
@@ -45,7 +44,6 @@
   FlutterShellArgsTest.class,
   FlutterRendererTest.class,
   FlutterViewTest.class,
-  InputConnectionAdaptorTest.class,
   PlatformChannelTest.class,
   PlatformPluginTest.class,
   PluginComponentTest.class,