Finish the rename from cc::GraphicsContext to cc::OutputSurface

cc/gl_renderer.cc

Index: cc/gl_renderer.cc
diff --git a/cc/gl_renderer.cc b/cc/gl_renderer.cc
index 9fa72f2c673d6f9ee8ac4564cfce96d5cb217501..4bde817608ee28da0fef456005e4af762bc44062 100644
--- a/cc/gl_renderer.cc
+++ b/cc/gl_renderer.cc
@@ -102,9 +102,6 @@ bool GLRenderer::initialize()
     else
         m_capabilities.usingAcceleratedPainting = false;
 
-
-    m_capabilities.contextHasCachedFrontBuffer = extensions.count("GL_CHROMIUM_front_buffer_cached");
-
     m_capabilities.usingPartialSwap = settings().partialSwapEnabled && extensions.count("GL_CHROMIUM_post_sub_buffer");
 
     // Use the swapBuffers callback only with the threaded proxy.
@@ -1350,7 +1347,7 @@ void GLRenderer::ensureFramebuffer()
 
 void GLRenderer::onContextLost()
 {
-    m_client->didLoseContext();
+    m_client->didLoseOutputSurface();
 }