rename GrDrawTargetCaps to GrCaps

Review URL: https://codereview.chromium.org/1133123009
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 368e536..7d9c50d 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -55,7 +55,7 @@
 
 }
 
-GrGLCaps::GrGLCaps(const GrGLCaps& caps) : GrDrawTargetCaps() {
+GrGLCaps::GrGLCaps(const GrGLCaps& caps) : GrCaps() {
     *this = caps;
 }
 
@@ -256,7 +256,7 @@
     this->initStencilFormats(ctxInfo);
 
     /**************************************************************************
-     * GrDrawTargetCaps fields
+     * GrCaps fields
      **************************************************************************/
     if (kGL_GrGLStandard == standard) {
         // we could also look for GL_ATI_separate_stencil extension or