Fix random lint warnings in chrome/android/shell

BUG=266140

Review URL: https://codereview.chromium.org/900103002

Cr-Commit-Position: refs/heads/master@{#314914}

chrome/android/shell/res/layout/chrome_shell_activity.xml

@@ -39,8 +39,6 @@
                 android:layout_weight="1"
                 android:gravity="bottom"
                 android:textSize="18sp"
-                android:autoText="true"
-                android:capitalize="sentences"
                 android:singleLine="true"
                 android:selectAllOnFocus="true"
                 android:hint="@string/url_hint"

chrome/android/shell/res/layout/suggestion_item.xml

@@ -12,7 +12,7 @@
     android:gravity="center_vertical"
     android:orientation="horizontal">
 
-    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    <LinearLayout
         android:id="@+id/inner_layout"
         android:layout_width="0dp"
         android:layout_height="match_parent"
@@ -28,6 +28,7 @@
             android:ellipsize="end"
             android:singleLine="true"
             android:textAlignment="viewStart"
+            android:gravity="start"
             android:textSize="18sp"
             android:includeFontPadding="false"/>
 
@@ -41,6 +42,7 @@
             android:ellipsize="end"
             android:singleLine="true"
             android:textAlignment="viewStart"
+            android:gravity="start"
             android:includeFontPadding="false"/>
     </LinearLayout>
 
@@ -51,6 +53,7 @@
         android:layout_height="match_parent"
         android:gravity="end"
         android:scaleType="center"
-        android:src="@drawable/suggestion_arrow"/>
+        android:src="@drawable/suggestion_arrow"
+        android:contentDescription="@null" />
 </LinearLayout>
 

chrome/android/shell/res/menu/main_menu.xml

@@ -9,7 +9,7 @@
     <group
         android:id="@+id/MAIN_MENU"
         android:visible="false" >
-        <item>
+        <item android:title="@null">
             <menu>
                 <item
                     android:id="@+id/back_menu_id"
@@ -37,7 +37,7 @@
         <item
             android:id="@+id/distill_page"
             android:title="@string/distill_page_menu"/>
-        <item>
+        <item android:title="@null">
             <menu>
                 <item
                     android:id="@+id/share_menu_id"