Revert "Release warmed-up child process"

This reverts commit 4ad2edc7f983a69b1b6162e7c974bc03238bc4bd.

Change-Id: Iba98604f0fb4b7b2bb614f4923fa0d8396895749
diff --git a/src/com/android/browser/EngineInitializer.java b/src/com/android/browser/EngineInitializer.java
index bbd20d3..653e7d8 100644
--- a/src/com/android/browser/EngineInitializer.java
+++ b/src/com/android/browser/EngineInitializer.java
@@ -428,6 +428,5 @@
     }
 
     public static void onActivityDestroy(BrowserActivity activity) {
-        Engine.releaseSpareChildProcess();
     }
 }