Revert of Let ImeAdapterAndroid have the same lifecycle as its Java peer

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

 // Copyright 2014 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.tab;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.app.Application;
 import android.content.Context;
@@ skipping 2303 matching lines @@
         // (zero) to the renderer process, although the new size will be set soon.
         // However, this size fluttering may confuse Blink and rendered result can be broken
         // (see http://crbug.com/340987).
         newContentViewCore.onSizeChanged(originalWidth, originalHeight, 0, 0);
         if (!bounds.isEmpty()) {
             newContentViewCore.onPhysicalBackingSizeChanged(bounds.right, bounds.bottom);
         }
         newContentViewCore.onShow();
         setContentViewCore(newContentViewCore);
 
+        mContentViewCore.attachImeAdapter();
+
         // If the URL has already committed (e.g. prerendering), tell process management logic that
         // it can rely on the process visibility signal for binding management.
         // TODO: Call ChildProcessLauncher#determinedVisibility() at a more intuitive time.
         // See crbug.com/537671
         if (!mContentViewCore.getWebContents().getLastCommittedUrl().equals("")) {
             ChildProcessLauncher.determinedVisibility(mContentViewCore.getCurrentRenderProcessId());
         }
 
         destroyNativePageInternal(previousNativePage);
         for (TabObserver observer : mObservers) {
@@ skipping 752 matching lines @@
     private native boolean nativeIsOfflinePage(long nativeTabAndroid);
     private native OfflinePageItem nativeGetOfflinePage(long nativeTabAndroid);
     private native void nativeSetInterceptNavigationDelegate(long nativeTabAndroid,
             InterceptNavigationDelegate delegate);
     private native void nativeAttachToTabContentManager(long nativeTabAndroid,
             TabContentManager tabContentManager);
     private native boolean nativeHasPrerenderedUrl(long nativeTabAndroid, String url);
     private native void nativeSetWebappManifestScope(long nativeTabAndroid, String scope);
     private native void nativeEnableEmbeddedMediaExperience(long nativeTabAndroid, boolean enabled);
 }