Remove ContextProvider::IsContextLost.

cc/output/program_binding.cc

Index: cc/output/program_binding.cc
diff --git a/cc/output/program_binding.cc b/cc/output/program_binding.cc
index 7809e1085c7b11cd5e903e3dd911145eacacf7a1..c05447c7d65037c762a8bd590af50919be6e0910 100644
--- a/cc/output/program_binding.cc
+++ b/cc/output/program_binding.cc
@@ -6,6 +6,7 @@
 
 #include "base/trace_event/trace_event.h"
 #include "cc/output/geometry_binding.h"
+#include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 
 using gpu::gles2::GLES2Interface;
@@ -129,4 +130,8 @@ void ProgramBindingBase::CleanupShaders(GLES2Interface* context) {
   }
 }
 
+bool ProgramBindingBase::IsContextLost(GLES2Interface* context) {
+  return context->GetGraphicsResetStatusKHR() != GL_NO_ERROR;
+}
+
 }  // namespace cc