Migrate most uses of Isolate::current_zone to Thread::zone.

runtime/vm/profiler_service.cc

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/profiler_service.h"
 
 #include "vm/growable_array.h"
 #include "vm/native_symbol.h"
 #include "vm/object.h"
 #include "vm/os.h"
@@ skipping 234 matching lines @@
 bool ProfileCode::IsOptimizedDart() const {
   return !code_.IsNull() && code_.is_optimized();
 }
 
 
 void ProfileCode::SetName(const char* name) {
   if (name == NULL) {
     name_ = NULL;
   }
   intptr_t len = strlen(name);
-  name_ = Isolate::Current()->current_zone()->Alloc<const char>(len + 1);
+  name_ = Thread::Current()->zone()->Alloc<const char>(len + 1);
   strncpy(const_cast<char*>(name_), name, len);
   const_cast<char*>(name_)[len] = '\0';
 }
 
 
 void ProfileCode::GenerateAndSetSymbolName(const char* prefix) {
   const intptr_t kBuffSize = 512;
   char buff[kBuffSize];
   OS::SNPrint(&buff[0], kBuffSize-1, "%s [%" Px ", %" Px ")",
               prefix, start(), end());
@@ skipping 1754 matching lines @@
   ASSERT(sample_buffer != NULL);
 
   ClearProfileVisitor clear_profile(isolate);
   sample_buffer->VisitSamples(&clear_profile);
 
   // Enable profile interrupts.
   Profiler::BeginExecution(isolate);
 }
 
 }  // namespace dart