Remove unused show types

Author: andrewheard

packages/firebase_ai/firebase_ai/lib/src/api.dart

@@ -172,25 +172,6 @@ final class UsageMetadata {
   final List<ModalityTokenCount>? candidatesTokensDetails;
 }
 
-/// Constructe a UsageMetadata with all it's fields.
-///
-/// Expose access to the private constructor for use within the package..
-UsageMetadata createUsageMetadata({
-  required int? promptTokenCount,
-  required int? candidatesTokenCount,
-  required int? totalTokenCount,
-  required int? thoughtsTokenCount,
-  required List<ModalityTokenCount>? promptTokensDetails,
-  required List<ModalityTokenCount>? candidatesTokensDetails,
-}) =>
-    UsageMetadata._(
-        promptTokenCount: promptTokenCount,
-        candidatesTokenCount: candidatesTokenCount,
-        totalTokenCount: totalTokenCount,
-        thoughtsTokenCount: thoughtsTokenCount,
-        promptTokensDetails: promptTokensDetails,
-        candidatesTokensDetails: candidatesTokensDetails);
-
 /// Response candidate generated from a [GenerativeModel].
 final class Candidate {
   // TODO: token count?
@@ -1292,7 +1273,7 @@ UsageMetadata parseUsageMetadata(Object jsonObject) {
       candidatesTokensDetails.map(_parseModalityTokenCount).toList(),
     _ => null,
   };
-  return createUsageMetadata(
+  return UsageMetadata._(
     promptTokenCount: promptTokenCount,
     candidatesTokenCount: candidatesTokenCount,
     totalTokenCount: totalTokenCount,

packages/firebase_ai/firebase_ai/lib/src/developer/api.dart

@@ -20,21 +20,17 @@ import '../api.dart'
         Candidate,
         Citation,
         CitationMetadata,
-        ContentModality,
         CountTokensResponse,
         FinishReason,
         GenerateContentResponse,
         GenerationConfig,
         HarmBlockThreshold,
         HarmCategory,
         HarmProbability,
-        ModalityTokenCount,
         PromptFeedback,
         SafetyRating,
         SafetySetting,
         SerializationStrategy,
-        UsageMetadata,
-        createUsageMetadata,
         parseUsageMetadata;
 import '../content.dart'
     show Content, FunctionCall, InlineDataPart, Part, TextPart;