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

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

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index 970648e520909234019d3b330707751db92bb8f1..b6b3dac2e70a20c947d26792076dbba34d41ca24 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -2309,6 +2309,8 @@
         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.