Remove WGC3D::isContextLost references from cc

cc/output/context_provider.h

Index: cc/output/context_provider.h
diff --git a/cc/output/context_provider.h b/cc/output/context_provider.h
index 0a794d77d6882648cb776fab0b4304843bbdd4d3..d87127c4c63c97ff1b6db193fe7c706aca7b2bc9 100644
--- a/cc/output/context_provider.h
+++ b/cc/output/context_provider.h
@@ -29,7 +29,6 @@ class ContextProvider : public base::RefCountedThreadSafe<ContextProvider> {
   virtual class GrContext* GrContext() = 0;
 
   struct Capabilities {
-    bool bind_uniform_location;
     bool discard_backbuffer;
     bool egl_image_external;
     bool fast_npot_mo8_textures;
@@ -53,6 +52,9 @@ class ContextProvider : public base::RefCountedThreadSafe<ContextProvider> {
   // Returns the capabilities of the currently bound 3d context.
   virtual Capabilities ContextCapabilities() = 0;
 
+  // Checks if the context is currently known to be lost.
+  virtual bool IsContextLost() = 0;
+
   // Ask the provider to check if the contexts are valid or lost. If they are,
   // this should invalidate the provider so that it can be replaced with a new
   // one.