Remove ChromePrerenderService, keeping only its skeleton behind.

chrome/android/java/src/org/chromium/chrome/browser/WarmupManager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/WarmupManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/WarmupManager.java b/chrome/android/java/src/org/chromium/chrome/browser/WarmupManager.java
index 60a4440cc2d2512e91cf9821efe55bef695184e1..1ed116eb2b8235e193a87867445b20610e01cfb5 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/WarmupManager.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/WarmupManager.java
@@ -19,9 +19,7 @@ import org.chromium.base.ThreadUtils;
 import org.chromium.base.TraceEvent;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.net.spdyproxy.DataReductionProxySettings;
-import org.chromium.chrome.browser.prerender.ExternalPrerenderHandler;
 import org.chromium.chrome.browser.profiles.Profile;
-import org.chromium.content_public.browser.WebContents;
 
 import java.net.InetAddress;
 import java.net.MalformedURLException;
@@ -46,12 +44,8 @@ public final class WarmupManager {
     private final Set<String> mDnsRequestsInFlight;
     private final Map<String, Profile> mPendingPreconnectWithProfile;
 
-    private boolean mPrerenderIsAllowed;
-    private WebContents mPrerenderedWebContents;
-    private boolean mPrerendered;
     private int mToolbarContainerId;
     private ViewGroup mMainView;
-    private ExternalPrerenderHandler mExternalPrerenderHandler;
 
     /**
      * @return The singleton instance for the WarmupManager, creating one if necessary.
@@ -63,83 +57,11 @@ public final class WarmupManager {
     }
 
     private WarmupManager() {
-        mPrerenderIsAllowed = true;
         mDnsRequestsInFlight = new HashSet<String>();
         mPendingPreconnectWithProfile = new HashMap<String, Profile>();
     }
 
     /**
-     * Disallow prerendering from now until the browser process death.
-     */
-    public void disallowPrerendering() {
-        ThreadUtils.assertOnUiThread();
-        mPrerenderIsAllowed = false;
-        cancelCurrentPrerender();
-        mExternalPrerenderHandler = null;
-    }
-
-    /**
-     * Check whether prerender manager has the given url prerendered. This also works with
-     * redirected urls.
-     *
-     * Uses the last used profile.
-     *
-     * @param url The url to check.
-     * @return Whether the given url has been prerendered.
-     */
-    public boolean hasPrerenderedUrl(String url) {
-        ThreadUtils.assertOnUiThread();
-        if (!mPrerenderIsAllowed) return false;
-        return hasAnyPrerenderedUrl() && ExternalPrerenderHandler.hasPrerenderedUrl(
-                Profile.getLastUsedProfile(), url, mPrerenderedWebContents);
-    }
-
-    /**
-     * @return Whether any url has been prerendered.
-     */
-    public boolean hasAnyPrerenderedUrl() {
-        ThreadUtils.assertOnUiThread();
-        if (!mPrerenderIsAllowed) return false;
-        return mPrerendered;
-    }
-
-    /**
-     * @return The prerendered {@link WebContents} clearing out the reference WarmupManager owns.
-     */
-    public WebContents takePrerenderedWebContents() {
-        ThreadUtils.assertOnUiThread();
-        if (!mPrerenderIsAllowed) return null;
-        WebContents prerenderedWebContents = mPrerenderedWebContents;
-        assert (mPrerenderedWebContents != null);
-        mPrerenderedWebContents = null;
-        return prerenderedWebContents;
-    }
-
-    /**
-     * Prerenders the given url using the prerender_manager.
-     *
-     * Uses the last used profile.
-     *
-     * @param url The url to prerender.
-     * @param referrer The referrer url to be used while prerendering
-     * @param widthPix The width in pixels to which the page should be prerendered.
-     * @param heightPix The height in pixels to which the page should be prerendered.
-     */
-    public void prerenderUrl(final String url, final String referrer,
-            final int widthPix, final int heightPix) {
-        ThreadUtils.assertOnUiThread();
-        if (!mPrerenderIsAllowed) return;
-        clearWebContentsIfNecessary();
-        if (mExternalPrerenderHandler == null) {
-            mExternalPrerenderHandler = new ExternalPrerenderHandler();
-        }
-
-        mPrerenderedWebContents = mExternalPrerenderHandler.addPrerender(
-                Profile.getLastUsedProfile(), url, referrer, widthPix, heightPix, false);
-        if (mPrerenderedWebContents != null) mPrerendered = true;
-    }
-
-    /**
      * Inflates and constructs the view hierarchy that the app will use.
      * @param baseContext The base context to use for creating the ContextWrapper.
      * @param toolbarContainerId Id of the toolbar container.
@@ -186,29 +108,6 @@ public final class WarmupManager {
     }
 
     /**
-     * Destroys the native WebContents instance the WarmupManager currently holds onto.
-     */
-    public void clearWebContentsIfNecessary() {
-        ThreadUtils.assertOnUiThread();
-        mPrerendered = false;
-        if (mPrerenderedWebContents == null) return;
-
-        mPrerenderedWebContents.destroy();
-        mPrerenderedWebContents = null;
-    }
-
-    /**
-     * Cancel the current prerender.
-     */
-    public void cancelCurrentPrerender() {
-        ThreadUtils.assertOnUiThread();
-        clearWebContentsIfNecessary();
-        if (mExternalPrerenderHandler == null) return;
-
-        mExternalPrerenderHandler.cancelCurrentPrerender();
-    }
-
-    /**
      * @return Whether the view hierarchy has been prebuilt with a given toolbar ID. If there is no
      * match, clears the inflated view.
      */