Removed unused member functions from GPU decoder

[prabhat00155]

References to these member functions were removed as a result of #5191.
Partly addresses #5205.

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit 938f4a2 (more details on the Dr. CI page):

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• 2/2 failures introduced in this PR

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🕵️ 1 new failure recognized by patterns

The following CI failures do not appear to be due to upstream breakages:

CodeQL / build (1/1)

Step: "Build TorchVision" (full log | diagnosis details | 🔁 rerun)

2022-02-01T13:07:55.3295121Z ##[error]Process completed with exit code 1.

2022-02-01T13:07:55.1637264Z     self.finalize_options()
2022-02-01T13:07:55.1638024Z   File "/home/runner/.local/lib/python3.8/site-packages/setuptools/command/develop.py", line 52, in finalize_options
2022-02-01T13:07:55.1638933Z     easy_install.finalize_options(self)
2022-02-01T13:07:55.1639695Z   File "/home/runner/.local/lib/python3.8/site-packages/setuptools/command/easy_install.py", line 276, in finalize_options
2022-02-01T13:07:55.1640317Z     self._fix_install_dir_for_user_site()
2022-02-01T13:07:55.1691836Z   File "/home/runner/.local/lib/python3.8/site-packages/setuptools/command/easy_install.py", line 382, in _fix_install_dir_for_user_site
2022-02-01T13:07:55.1692206Z     self.create_home_path()
2022-02-01T13:07:55.1692870Z   File "/home/runner/.local/lib/python3.8/site-packages/setuptools/command/easy_install.py", line 1338, in create_home_path
2022-02-01T13:07:55.1693270Z     if path.startswith(home) and not os.path.isdir(path):
2022-02-01T13:07:55.1693668Z AttributeError: 'int' object has no attribute 'startswith'
2022-02-01T13:07:55.3295121Z ##[error]Process completed with exit code 1.
2022-02-01T13:07:55.3350428Z Post job cleanup.
2022-02-01T13:07:55.4536332Z [command]/usr/bin/git version
2022-02-01T13:07:55.4592185Z git version 2.34.1
2022-02-01T13:07:55.4624676Z [command]/usr/bin/git config --local --name-only --get-regexp core\.sshCommand
2022-02-01T13:07:55.4672292Z [command]/usr/bin/git submodule foreach --recursive git config --local --name-only --get-regexp 'core\.sshCommand' && git config --local --unset-all 'core.sshCommand' || :
2022-02-01T13:07:55.5030766Z [command]/usr/bin/git config --local --name-only --get-regexp http\.https\:\/\/github\.com\/\.extraheader
2022-02-01T13:07:55.5068211Z http.https://github.com/.extraheader
2022-02-01T13:07:55.5080264Z [command]/usr/bin/git config --local --unset-all http.https://github.com/.extraheader
2022-02-01T13:07:55.5127934Z [command]/usr/bin/git submodule foreach --recursive git config --local --name-only --get-regexp 'http\.https\:\/\/github\.com\/\.extraheader' && git config --local --unset-all 'http.https://github.com/.extraheader' || :
2022-02-01T13:07:55.5696004Z Cleaning up orphan processes

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1 failure not recognized by patterns:

Job	Step	Action
cmake_macos_cpu	curl -o conda.sh https://repo.anaconda.com/miniconda/Miniconda3-latest-MacOSX-x86_64.sh
sh conda.sh -b
source $HOME/miniconda3/bin/activate
conda install -yq conda-build cmake
packaging/build_cmake.sh
	🔁 rerun

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[NicolasHug]

Thanks @prabhat00155 , stamping