Remove final users of dart:profiler library

BUG=
R=turnidge@google.com

Review URL: https://codereview.chromium.org/1394533002 .

pkg/analyzer/lib/src/generated/utilities_general.dart

@@ -4,7 +4,7 @@
 
 library engine.utilities.general;
 
-import 'dart:profiler';
+import 'dart:developer' show UserTag;
 
 /**
  * Jenkins hash function, optimized for small integers.
@@ -33,7 +33,7 @@ class JenkinsSmiHash {
 
 /**
  * Helper class for gathering performance statistics.  This class is modeled on
- * the UserTag class in dart:profiler so that it can interoperate easily with
+ * the UserTag class in dart:developer so that it can interoperate easily with
  * it.
  */
 abstract class PerformanceTag {

pkg/compiler/lib/src/common/tasks.dart

@@ -4,7 +4,7 @@
 
 library dart2js.common.tasks;
 
-import 'dart:profiler' show
+import 'dart:developer' show
     UserTag;
 import '../compiler.dart' show
     Compiler;

pkg/dart2js_incremental/lib/dart2js_incremental.dart

@@ -8,7 +8,7 @@ import 'dart:async' show
     EventSink,
     Future;
 
-import 'dart:profiler' show
+import 'dart:developer' show
     UserTag;
 
 import 'package:compiler/src/apiimpl.dart' show

runtime/vm/thread_test.cc

@@ -358,7 +358,7 @@ TEST_CASE(SafepointTestDart) {
 #endif  // USING_SIMULATOR
   char buffer[1024];
   OS::SNPrint(buffer, sizeof(buffer),
-      "import 'dart:profiler';\n"
+      "import 'dart:developer';\n"
       "int dummy = 0;\n"
       "main() {\n"
       "  new UserTag('foo').makeCurrent();\n"