Move most zygote related code to frameworks/base.

Avoids code duplication across art/dalvik. Also, most of
this code is not directly related to the runtime (mounting external
storage, multi user etc.) and therefore belongs in the frameworks.

Change-Id: Icf4723dd0ec4521ef6b1f785c99d50aebca7779a
diff --git a/runtime/Android.mk b/runtime/Android.mk
index 1576905..210d7a5 100644
--- a/runtime/Android.mk
+++ b/runtime/Android.mk
@@ -103,7 +103,7 @@
 	native/dalvik_system_VMDebug.cc \
 	native/dalvik_system_VMRuntime.cc \
 	native/dalvik_system_VMStack.cc \
-	native/dalvik_system_Zygote.cc \
+	native/dalvik_system_ZygoteHooks.cc \
 	native/java_lang_Class.cc \
 	native/java_lang_DexCache.cc \
 	native/java_lang_Object.cc \