LibJS: Rename Utf16String::to_utf8 to to_deprecated_string

Userland/Libraries/LibJS/Runtime/PrimitiveString.cpp

@@ -70,7 +70,7 @@ ThrowCompletionOr<DeprecatedString> PrimitiveString::deprecated_string() const
 
     if (!has_deprecated_string()) {
         VERIFY(has_utf16_string());
-        m_deprecated_string = TRY(m_utf16_string->to_utf8(vm()));
+        m_deprecated_string = TRY(m_utf16_string->to_deprecated_string(vm()));
     }
 
     return *m_deprecated_string;

Userland/Libraries/LibJS/Runtime/Utf16String.cpp

@@ -102,7 +102,7 @@ Utf16View Utf16String::substring_view(size_t code_unit_offset) const
     return view().substring_view(code_unit_offset);
 }
 
-ThrowCompletionOr<DeprecatedString> Utf16String::to_utf8(VM& vm) const
+ThrowCompletionOr<DeprecatedString> Utf16String::to_deprecated_string(VM& vm) const
 {
     return TRY_OR_THROW_OOM(vm, view().to_deprecated_string(Utf16View::AllowInvalidCodeUnits::Yes));
 }

Userland/Libraries/LibJS/Runtime/Utf16String.h

@@ -50,7 +50,7 @@ public:
     Utf16View substring_view(size_t code_unit_offset, size_t code_unit_length) const;
     Utf16View substring_view(size_t code_unit_offset) const;
 
-    ThrowCompletionOr<DeprecatedString> to_utf8(VM&) const;
+    ThrowCompletionOr<DeprecatedString> to_deprecated_string(VM&) const;
     u16 code_unit_at(size_t index) const;
 
     size_t length_in_code_units() const;