Revert of Remove migrateNetworkPredictionPreferences().

chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/BandwidthType.java

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/BandwidthType.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/BandwidthType.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/BandwidthType.java
new file mode 100644
index 0000000000000000000000000000000000000000..ef6eb195c02d43bb412bd70fe2c62e136ae3f0f3
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/BandwidthType.java
@@ -0,0 +1,46 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.preferences.privacy;
+
+/**
+ * Bandwidth options available based on network.
+ */
+public enum BandwidthType {
+
+    // Still using "prerender" in the strings for historical reasons: we don't want to break
+    // existing users' settings.
+    NEVER_PRERENDER      ("never_prefetch"),
+    PRERENDER_ON_WIFI    ("prefetch_on_wifi"),
+    ALWAYS_PRERENDER     ("always_prefetch");
+
+    public static final BandwidthType DEFAULT = PRERENDER_ON_WIFI;
+
+    private final String mTitle;
+
+    BandwidthType(String title) {
+        mTitle = title;
+    }
+
+    /**
+     * Returns the title of the bandwidthType.
+     * @return title
+     */
+    public String title() {
+        return mTitle;
+    }
+
+    /**
+     * Get the BandwidthType from the title.
+     * @param title
+     * @return BandwidthType
+     */
+    public static BandwidthType getBandwidthFromTitle(String title) {
+        for (BandwidthType b : BandwidthType.values()) {
+            if (b.mTitle.equals(title)) return b;
+        }
+        assert false;
+        return DEFAULT;
+    }
+}