Revert r15361 "Improved function entry hook coverage" because of ARM build error.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 2383399f7fd863e2d00be7c6c20b17ca7ef281d9..476e405249974bc23cd73fdf83b98af439b51a4b 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1753,10 +1753,8 @@ Isolate::Isolate()
       date_cache_(NULL),
       code_stub_interface_descriptors_(NULL),
       context_exit_happened_(false),
-      initialized_from_snapshot_(false),
       cpu_profiler_(NULL),
       heap_profiler_(NULL),
-      function_entry_hook_(NULL),
       deferred_handles_head_(NULL),
       optimizing_compiler_thread_(this),
       marking_thread_(NULL),
@@ -2079,14 +2077,6 @@ bool Isolate::Init(Deserializer* des) {
   ASSERT(Isolate::Current() == this);
   TRACE_ISOLATE(init);
 
-  if (function_entry_hook() != NULL) {
-    // When function entry hooking is in effect, we have to create the code
-    // stubs from scratch to get entry hooks, rather than loading the previously
-    // generated stubs from disk.
-    // If this assert fires, the initialization path has regressed.
-    ASSERT(des == NULL);
-  }
-
   // The initialization process does not handle memory exhaustion.
   DisallowAllocationFailure disallow_allocation_failure;
 
@@ -2278,9 +2268,6 @@ bool Isolate::Init(Deserializer* des) {
       sweeper_thread_[i]->Start();
     }
   }
-
-  initialized_from_snapshot_ = (des != NULL);
-
   return true;
 }