[vm] Remove warnings about non-standard stack traces.

The language team has clarified in
dart-lang/language#1212 that the content of
stack traces is not specified in a way that is violated by either
obfuscation or non-symbolic stack traces. Thus, we remove the warnings
about supposedly standard-violating stack traces.

TEST=No change in actual functionality, so tested manually.

Bug: #43388
Change-Id: I2c7ac44cf2f9afafa85d902b2783e1173e727264
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249185
Commit-Queue: Tess Strickland <[email protected]>
Reviewed-by: Daco Harkes <[email protected]>
Reviewed-by: Martin Kustermann <[email protected]>

Author: sstrickl

runtime/vm/isolate.cc

@@ -1739,13 +1739,6 @@ Isolate::Isolate(IsolateGroup* isolate_group,
   // how the vm_tag (kEmbedderTagId) can be set, these tags need to
   // move to the OSThread structure.
   set_user_tag(UserTags::kDefaultUserTag);
-
-  if (group()->obfuscate()) {
-    OS::PrintErr(
-        "Warning: This VM has been configured to obfuscate symbol information "
-        "which violates the Dart standard.\n"
-        "         See dartbug.com/30524 for more information.\n");
-  }
 }
 
 #undef REUSABLE_HANDLE_SCOPE_INIT

runtime/vm/object.cc

@@ -25878,12 +25878,6 @@ const char* StackTrace::ToCString() const {
         isolate_instructions_image.instructions_relocated_address();
     auto const vm_relocated_address =
         vm_instructions_image.instructions_relocated_address();
-    // The Dart standard requires the output of StackTrace.toString to include
-    // all pending activations with precise source locations (i.e., to expand
-    // inlined frames and provide line and column numbers).
-    buffer.Printf(
-        "Warning: This VM has been configured to produce stack traces "
-        "that violate the Dart standard.\n");
     // This prologue imitates Android's debuggerd to make it possible to paste
     // the stack trace into ndk-stack.
     buffer.Printf(