Revert 278059 "gpu: Add base class for gpu service tests"

Revert 278059 "gpu: Add base class for gpu service tests"

Does not compile on Linux GN:
http://build.chromium.org/p/chromium.linux/builders/Linux%20GN%20%28dbg%29/builds/7304/steps/compile/logs/stdio

> gpu: Add base class for gpu service tests
> 
> This allows for properly setting up and tearing down GL bindings.
> Before this patch bindings were intialized in unittest_main.cc but also
> reinitialized with a different GL version and extension in some
> GLES2CmdDecoderTests which leaves room for problems depending on which order
> tests happen to run in.
> 
> More importantly, this will allow me to initialize GL bindings with a certain
> GL version and extension bindings for some tests.
> 
> Review URL: https://codereview.chromium.org/332303002

TBR=sievers@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278064

[macourteau, 2014-06-18 14:57:00]

Committed patchset #1 manually as r278064 (tree was closed).