Revert of Reimplement automation API on top of C++-backed AXTree.

extensions/renderer/logging_native_handler.cc

Index: extensions/renderer/logging_native_handler.cc
diff --git a/extensions/renderer/logging_native_handler.cc b/extensions/renderer/logging_native_handler.cc
index 86fbc9c9fbe4d1cb62f4910b2f195b06b5c20c7d..8a913a15f258af3340ea46d167300e564a5539c1 100644
--- a/extensions/renderer/logging_native_handler.cc
+++ b/extensions/renderer/logging_native_handler.cc
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "extensions/renderer/logging_native_handler.h"
+
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
-#include "extensions/renderer/logging_native_handler.h"
-#include "extensions/renderer/script_context.h"
 
 namespace extensions {
 
@@ -72,7 +72,31 @@
     *error_message = "Error: " + std::string(*v8::String::Utf8Value(args[1]));
   }
 
-  *error_message += "\n" + context()->GetStackTraceAsString();
+  v8::Local<v8::StackTrace> stack_trace =
+      v8::StackTrace::CurrentStackTrace(args.GetIsolate(), 10);
+  if (stack_trace.IsEmpty() || stack_trace->GetFrameCount() <= 0) {
+    *error_message += "\n    <no stack trace>";
+  } else {
+    for (size_t i = 0; i < (size_t)stack_trace->GetFrameCount(); ++i) {
+      v8::Local<v8::StackFrame> frame = stack_trace->GetFrame(i);
+      CHECK(!frame.IsEmpty());
+      *error_message += base::StringPrintf(
+          "\n    at %s (%s:%d:%d)",
+          ToStringOrDefault(frame->GetFunctionName(), "<anonymous>").c_str(),
+          ToStringOrDefault(frame->GetScriptName(), "<anonymous>").c_str(),
+          frame->GetLineNumber(),
+          frame->GetColumn());
+    }
+  }
+}
+
+std::string LoggingNativeHandler::ToStringOrDefault(
+    const v8::Local<v8::String>& v8_string,
+    const std::string& dflt) {
+  if (v8_string.IsEmpty())
+    return dflt;
+  std::string ascii_value = *v8::String::Utf8Value(v8_string);
+  return ascii_value.empty() ? dflt : ascii_value;
 }
 
 }  // namespace extensions