Make the ChromeBrowserInitializer the only way to start the browser process.

chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunActivity.java
index 360c6c2d3bf34f65d30d3395577a25fe625da5ea..4d69d08b66ae240504da854136c852f9ac98a333 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunActivity.java
@@ -11,9 +11,9 @@ import android.os.Bundle;
 import android.support.v4.view.ViewPager;
 import android.support.v7.app.AppCompatActivity;
 import android.text.TextUtils;
-import android.util.Log;
 
 import org.chromium.base.ApplicationStatus;
+import org.chromium.base.Log;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.library_loader.ProcessInitException;
 import org.chromium.base.metrics.RecordHistogram;
@@ -21,6 +21,7 @@ import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeApplication;
 import org.chromium.chrome.browser.EmbedContentViewActivity;
+import org.chromium.chrome.browser.init.ChromeBrowserInitializer;
 import org.chromium.chrome.browser.net.spdyproxy.DataReductionProxySettings;
 import org.chromium.chrome.browser.preferences.datareduction.DataReductionPromoScreen;
 import org.chromium.chrome.browser.preferences.datareduction.DataReductionProxyUma;
@@ -405,8 +406,7 @@ public class FirstRunActivity extends AppCompatActivity implements FirstRunPageD
         // This should happen before super.onCreate() because it might recreate a fragment,
         // and a fragment might depend on the native library.
         try {
-            ((ChromeApplication) getApplication())
-                    .startBrowserProcessesAndLoadLibrariesSync(true);
+            ChromeBrowserInitializer.getInstance(this).handleSynchronousStartup();
             mNativeSideIsInitialized = true;
         } catch (ProcessInitException e) {
             Log.e(TAG, "Unable to load native library.", e);