- Remove --coverage_dir flag and old-style coverage service requests.

runtime/vm/isolate.cc

Index: runtime/vm/isolate.cc
diff --git a/runtime/vm/isolate.cc b/runtime/vm/isolate.cc
index a7ebef5168d9f886cb0a4b305129d39caf2fb466..90ed73ab43e4c2be09fb22b4e85fc4e98adc5bcd 100644
--- a/runtime/vm/isolate.cc
+++ b/runtime/vm/isolate.cc
@@ -12,7 +12,6 @@
 #include "vm/code_observers.h"
 #include "vm/compiler.h"
 #include "vm/compiler_stats.h"
-#include "vm/coverage.h"
 #include "vm/dart_api_message.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
@@ -1561,12 +1560,6 @@ void Isolate::Shutdown() {
     StackZone stack_zone(thread);
     HandleScope handle_scope(thread);
 
-    // Write out the coverage data if collection has been enabled.
-    if ((this != Dart::vm_isolate()) &&
-        !ServiceIsolate::IsServiceIsolateDescendant(this)) {
-      CodeCoverage::Write(thread);
-    }
-
     // Write compiler stats data if enabled.
     if (FLAG_support_compiler_stats && FLAG_compiler_stats
         && !ServiceIsolate::IsServiceIsolateDescendant(this)