Reverts "[Impeller] use DeviceLocal textures for gifs on non-iOS devices. (#164573)" (#164600)

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Reverts: flutter/flutter#164573
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Initiated by: jonahwilliams
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Reason for reverting: le crash
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Original PR Author: jonahwilliams
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Reviewed By: {matanlurey}
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This change reverts the following previous change:
Part of https://github.com/flutter/flutter/issues/136365,
https://github.com/flutter/flutter/issues/134399


We only use DeviceLocal on iOS to work around background requirements.
On other platforms there is no need for this.
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Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>

engine/src/flutter/lib/ui/painting/image_decoder_impeller.cc

@@ -466,11 +466,7 @@ ImageDecoderImpeller::UploadTextureToStorage(
   }
 
   impeller::TextureDescriptor texture_descriptor;
-#ifdef FML_OS_IOS
   texture_descriptor.storage_mode = impeller::StorageMode::kHostVisible;
-#else
-  texture_descriptor.storage_mode = impeller::StorageMode::kDevicePrivate;
-#endif  // FML_OS_IOS
   texture_descriptor.format = pixel_format.value();
   texture_descriptor.size = {image_info.width(), image_info.height()};
   texture_descriptor.mip_count = 1;

engine/src/flutter/lib/ui/painting/image_decoder_unittests.cc

@@ -24,7 +24,6 @@
 #include "flutter/testing/test_gl_surface.h"
 #include "flutter/testing/testing.h"
 #include "fml/logging.h"
-#include "impeller/core/formats.h"
 #include "impeller/core/runtime_types.h"
 #include "impeller/renderer/command_queue.h"
 #include "third_party/skia/include/codec/SkCodecAnimation.h"
@@ -387,16 +386,6 @@ TEST_F(ImageDecoderFixtureTest, ImpellerUploadToSharedNoGpu) {
   ASSERT_EQ(result.second, "");
   EXPECT_EQ(no_gpu_access_context->DidDisposeResources(), true);
 
-#if FML_OS_IOS
-  EXPECT_EQ(
-      result.first->impeller_texture()->GetTextureDescriptor().storage_mode,
-      impeller::StorageMode::kHostVisible);
-#else
-  EXPECT_EQ(
-      result.first->impeller_texture()->GetTextureDescriptor().storage_mode,
-      impeller::StorageMode::kDevicePrivate);
-#endif  // FML_OS_IOS
-
   no_gpu_access_context->FlushTasks(/*fail=*/true);
 }