remove a bunch of isolate::current in api.cc

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index e783727c2db5ad7310136342d1aa9a55cb8f8dc1..3d9860a01f36684087608310bbf3a1eac43af505 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -5505,9 +5505,17 @@ class V8_EXPORT TryCatch {
    * all TryCatch blocks should be stack allocated because the memory
    * location itself is compared against JavaScript try/catch blocks.
    */
+  // TODO(dcarney): deprecate.
   TryCatch();
 
   /**
+   * Creates a new try/catch block and registers it with v8.  Note that
+   * all TryCatch blocks should be stack allocated because the memory
+   * location itself is compared against JavaScript try/catch blocks.
+   */
+  TryCatch(Isolate* isolate);
+
+  /**
    * Unregisters and deletes this try/catch block.
    */
   ~TryCatch();