Revert 158076 - Implement blacklist's force GPU capability in dual GPU machines.

ui/gl/gl_switches.cc

Index: ui/gl/gl_switches.cc
===================================================================
--- ui/gl/gl_switches.cc	(revision 158210)
+++ ui/gl/gl_switches.cc	(working copy)
@@ -43,17 +43,8 @@
 // Simulates a slow GPU.
 const char kGpuSwapDelay[]                  = "gpu-swap-delay";
 
-// Overwrite the default GPU automatic switching behavior to force on
-// integrated GPU or discrete GPU.
-const char kGpuSwitching[]                  = "gpu-switching";
-
-const char kGpuSwitchingOptionNameForceIntegrated[] = "force_integrated";
-const char kGpuSwitchingOptionNameForceDiscrete[]   = "force_discrete";
-const char kGpuSwitchingOptionNameAutomatic[]   = "automatic";
-
 // Flag used for Linux tests: for desktop GL bindings, try to load this GL
 // library first, but fall back to regular library if loading fails.
 const char kTestGLLib[]                     = "test-gl-lib";
 
 }  // namespace switches
-