Remove unused features for in-process GL contexts.

gpu/command_buffer/client/gl_in_process_context.h

Index: gpu/command_buffer/client/gl_in_process_context.h
diff --git a/gpu/command_buffer/client/gl_in_process_context.h b/gpu/command_buffer/client/gl_in_process_context.h
index 36484cef18e7bb628e6eb9e8d88abbcca3d5b310..a338f82934d2a1d3a25bc32b9598248257bdc9ee 100644
--- a/gpu/command_buffer/client/gl_in_process_context.h
+++ b/gpu/command_buffer/client/gl_in_process_context.h
@@ -55,8 +55,6 @@ class GL_IN_PROCESS_CONTEXT_EXPORT GLInProcessContext {
   // service must run on the same thread as this client because GLSurface is
   // not thread safe. If |surface| is NULL, then the other parameters are used
   // to correctly create a surface.
-  // Only one of |share_context| and |use_global_share_group| can be used at
-  // the same time.
   static GLInProcessContext* Create(
       scoped_refptr<gpu::InProcessCommandBuffer::Service> service,
       scoped_refptr<gfx::GLSurface> surface,
@@ -64,7 +62,6 @@ class GL_IN_PROCESS_CONTEXT_EXPORT GLInProcessContext {
       gfx::AcceleratedWidget window,
       const gfx::Size& size,
       GLInProcessContext* share_context,
-      bool use_global_share_group,
       const gpu::gles2::ContextCreationAttribHelper& attribs,
       gfx::GpuPreference gpu_preference,
       const GLInProcessContextSharedMemoryLimits& memory_limits,