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This reverts commit b3a546fe.

Reason for revert: 
On Win and Linux rel builder and others:

ninja explain: output gen/third_party/blink/renderer/bindings/core/v8/v8_example.cc doesn't exist

https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8898644624214693520/+/steps/compile_confirm_no-op/0/stdout

Original change's description:
> bind-gen: Support generation of function definitions.
> 
> This is just a first step to support the code generation
> of bindings callback functions.
> 
> Introduces CodeGenerationContext for convenience, and
> also demonstrates make_common_local_vars().
> 
> Bug: 839389
> Change-Id: I9ff49b4bfc6bd98e6b29687cc01f986c2baa01fa
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1855325
> Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
> Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#709389}

TBR=peria@chromium.org,yukishiino@chromium.org

Change-Id: I99f572736c546f5f7078c6653d963264e6622512
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 839389
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879933Reviewed-by: Markus Heintz <markusheintz@chromium.org>
Commit-Queue: Markus Heintz <markusheintz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709402}