Use WebCore:DateTimeChooser for date/time form types instead of considering them text fields.

content/public/android/java/src/org/chromium/content/browser/DateTimePickerDialog.java

Index: content/public/android/java/src/org/chromium/content/browser/DateTimePickerDialog.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/DateTimePickerDialog.java b/content/public/android/java/src/org/chromium/content/browser/DateTimePickerDialog.java
index 87430ab7e4e4ec0263c38bba0f877b6bf23c54fb..c122c29000ae97e2b9cda52e23259a4aea7ef43d 100644
--- a/content/public/android/java/src/org/chromium/content/browser/DateTimePickerDialog.java
+++ b/content/public/android/java/src/org/chromium/content/browser/DateTimePickerDialog.java
@@ -126,8 +126,8 @@ class DateTimePickerDialog extends AlertDialog implements OnClickListener,
     @Override
     protected void onStop() {
         if (Build.VERSION.SDK_INT >= 16) {
-            // The default behavior of dialogs changed after JellyBean. In JB
-            // dismissing a dialog (by pressing back for example)
+            // The default behavior of dialogs changed in JellyBean and onwards.
+            // Dismissing a dialog (by pressing back for example)
             // applies the chosen date. This code is added here so that the custom
             // pickers behave the same as the internal DatePickerDialog.
             tryNotifyDateTimeSet();