Remove ClassRegister part 1.

We still need to do 3-way patch to avoid break downstream. We remove
the usage of ClassRegister first then remove the declaration in part 2.

part 2: http://crrev/c/1137105
Downstream CL: http://crrev/i/651721

Bug: 850652
Change-Id: I9148fdd7dfcb61e4f804b23e817e5bbd3dabc75d
Reviewed-on: https://chromium-review.googlesource.com/1138815Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Shimi Zhang <ctzsm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575440}

chrome/android/java/src/org/chromium/chrome/browser/init/ChromeBrowserInitializer.java

@@ -35,7 +35,6 @@ import org.chromium.chrome.browser.AppHooks;
 import org.chromium.chrome.browser.ChromeApplication;
 import org.chromium.chrome.browser.ChromeStrictMode;
 import org.chromium.chrome.browser.ChromeSwitches;
-import org.chromium.chrome.browser.ClassRegister;
 import org.chromium.chrome.browser.FileProviderHelper;
 import org.chromium.chrome.browser.crash.LogcatExtractionRunnable;
 import org.chromium.chrome.browser.download.DownloadManagerService;
@@ -399,7 +398,6 @@ public class ChromeBrowserInitializer {
         AppHooks.get().registerPolicyProviders(CombinedPolicyProvider.get());
 
         SpeechRecognition.initialize(mApplication);
-        ClassRegister.get().registerContentClassFactory();
     }
 
     private void onFinishNativeInitialization() {