Revert "Centralize the handling of completion for simple argument lists. (#82085)"

This reverts commit 21631494b068d9364b8dc8f18e59adee9131a0a5.

Reverted because of greendragon failure:

******************** TEST 'lldb-api :: functionalities/completion/TestCompletion.py' FAILED ********************
Script:

1 files changed, 19 insertions, 0 deletions

diff --git a/lldb/source/Commands/CommandObjectFrame.cpp b/lldb/source/Commands/CommandObjectFrame.cpp
index f092d54..a4d3fb6 100644
--- a/lldb/source/Commands/CommandObjectFrame.cpp
+++ b/lldb/source/Commands/CommandObjectFrame.cpp
@@ -286,6 +286,16 @@ public:
 
   ~CommandObjectFrameSelect() override = default;
 
+  void
+  HandleArgumentCompletion(CompletionRequest &request,
+                           OptionElementVector &opt_element_vector) override {
+    if (request.GetCursorIndex() != 0)
+      return;
+
+    lldb_private::CommandCompletions::InvokeCommonCompletionCallbacks(
+        GetCommandInterpreter(), lldb::eFrameIndexCompletion, request, nullptr);
+  }
+
   Options *GetOptions() override { return &m_options; }
 
 protected:
@@ -436,6 +446,15 @@ may even involve JITing and running code in the target program.)");
 
   Options *GetOptions() override { return &m_option_group; }
 
+  void
+  HandleArgumentCompletion(CompletionRequest &request,
+                           OptionElementVector &opt_element_vector) override {
+    // Arguments are the standard source file completer.
+    lldb_private::CommandCompletions::InvokeCommonCompletionCallbacks(
+        GetCommandInterpreter(), lldb::eVariablePathCompletion, request,
+        nullptr);
+  }
+
 protected:
   llvm::StringRef GetScopeString(VariableSP var_sp) {
     if (!var_sp)