Android Chromoting: Remove title and add navigation button to disconnect

remoting/android/java/src/org/chromium/chromoting/Desktop.java

Index: remoting/android/java/src/org/chromium/chromoting/Desktop.java
diff --git a/remoting/android/java/src/org/chromium/chromoting/Desktop.java b/remoting/android/java/src/org/chromium/chromoting/Desktop.java
index a7762fa7610ad3aa0ba4c5b526aab3cc3b3660d9..7135492743d024b9ea8c8791052d2e45f86bef06 100644
--- a/remoting/android/java/src/org/chromium/chromoting/Desktop.java
+++ b/remoting/android/java/src/org/chromium/chromoting/Desktop.java
@@ -51,7 +51,11 @@ public class Desktop extends ActionBarActivity implements View.OnSystemUiVisibil
         mOverlayButton = (ImageButton) findViewById(R.id.desktop_overlay_button);
         mRemoteHostDesktop.setDesktop(this);
 
-        // Ensure the button is initially hidden.
+        // For this Activity, the home button in the action bar acts as a Disconnect button, so
+        // set the description for accessibility/screen readers.
+        getSupportActionBar().setHomeActionContentDescription(R.string.disconnect_myself_button);
+
+        // Ensure the overlay button is initially hidden.
         showActionBar();
 
         View decorView = getWindow().getDecorView();
@@ -193,7 +197,7 @@ public class Desktop extends ActionBarActivity implements View.OnSystemUiVisibil
             hideActionBar();
             return true;
         }
-        if (id == R.id.actionbar_disconnect) {
+        if (id == R.id.actionbar_disconnect || id == android.R.id.home) {
             JniInterface.disconnectFromHost();
             return true;
         }