Maintain minimal error response.

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index 6896939a61291fdf79f510b0dec4e116adeb3dd8..92d7f5afd4dd72c6491a9c148a0e394e38812032 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -641,17 +641,17 @@ void ContentViewCoreImpl::ShowPastePopup(int x_dip, int y_dip) {
 
 void ContentViewCoreImpl::GetScaledContentBitmap(
     float scale,
-    SkColorType color_type,
+    SkColorType preferred_color_type,
     gfx::Rect src_subrect,
     ReadbackRequestCallback& result_callback) {
   RenderWidgetHostViewAndroid* view = GetRenderWidgetHostViewAndroid();
-  if (!view || color_type == kUnknown_SkColorType) {
+  if (!view || preferred_color_type == kUnknown_SkColorType) {
     result_callback.Run(SkBitmap(), READBACK_FAILED);
     return;
   }
 
-  view->GetScaledContentBitmap(scale, color_type, src_subrect,
-      result_callback);
+  view->GetScaledContentBitmap(scale, preferred_color_type, src_subrect,
+                               result_callback);
 }
 
 void ContentViewCoreImpl::StartContentIntent(const GURL& content_url) {