Revert of Report lost context from GLES2Implementation based on share group state.

gpu/command_buffer/tests/gl_manager.cc

Index: gpu/command_buffer/tests/gl_manager.cc
diff --git a/gpu/command_buffer/tests/gl_manager.cc b/gpu/command_buffer/tests/gl_manager.cc
index f11ea71fe04f03dbfe67682b0f241c9255a7aa57..182e58dd085360421db980b2db3819a32a94dcf4 100644
--- a/gpu/command_buffer/tests/gl_manager.cc
+++ b/gpu/command_buffer/tests/gl_manager.cc
@@ -584,6 +584,11 @@
   NOTIMPLEMENTED();
 }
 
+bool GLManager::IsGpuChannelLost() {
+  NOTIMPLEMENTED();
+  return false;
+}
+
 void GLManager::EnsureWorkVisible() {
   // This is only relevant for out-of-process command buffers.
 }