Misc search fix

- Remove incorrect summary from set date/time
- Remove some unused resources
- Remove ability to clear individual search history
- Add remove all query history menu item

Change-Id: I4383d075310297163fd2206d1a5b9c8f4ed94078
Fix: 62741488
Fix: 31589605
Test: robotests
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index c73c909..925b936 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -210,7 +210,7 @@
 
         <activity android:name=".search.SearchActivity"
                   android:label="@string/search_settings"
-                  android:icon="@drawable/ic_search_history"
+                  android:icon="@drawable/ic_search_24dp"
                   android:parentActivityName="Settings"
                   android:theme="@style/Theme.Settings.NoActionBar">
         </activity>