Fix up a few more lint warnings in chrome/

chrome/android/java/res/layout/autofill_credit_card_editor.xml

Index: chrome/android/java/res/layout/autofill_credit_card_editor.xml
diff --git a/chrome/android/java/res/layout/autofill_credit_card_editor.xml b/chrome/android/java/res/layout/autofill_credit_card_editor.xml
index 4ef788d95a49ff39d40fd93e6c211c670767d510..50ff218a4e1a679ad49a0e392d085d2b094d2822 100644
--- a/chrome/android/java/res/layout/autofill_credit_card_editor.xml
+++ b/chrome/android/java/res/layout/autofill_credit_card_editor.xml
@@ -32,7 +32,6 @@
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:imeOptions="flagNoExtractUi"
-                    android:contentDescription="@string/autofill_credit_card_editor_name"

[newt (away), 2015/02/18 18:58:11]

IIRC, there was a deliberate reason for adding both contentDescription and hint
text to these EditTexts. You should ask Theresa about it.

[Theresa, 2015/02/24 02:19:51]

When the field gains focus, FloatLabelLayout sets the EditText hint to null (so
that it stops showing up). It stays null until the field is completely cleared
and not in focus, hence the need for the content description.

                     android:inputType="textCapWords"
                     android:hint="@string/autofill_credit_card_editor_name" />
             </org.chromium.chrome.browser.widget.FloatLabelLayout>
@@ -44,7 +43,6 @@
                 <EditText
                     android:id="@+id/credit_card_number_edit"
                     android:layout_width="match_parent"
-                    android:contentDescription="@string/autofill_credit_card_editor_number"
                     android:layout_height="wrap_content"
                     android:imeOptions="flagNoExtractUi"
                     android:inputType="phone"