Replace uses of GrAssert by SkASSERT.

R=bsalomon@google.com

Review URL: https://codereview.chromium.org/22850006

git-svn-id: http://skia.googlecode.com/svn/trunk@10789 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGLIndexBuffer.h b/src/gpu/gl/GrGLIndexBuffer.h
index 5c8588b..32a8086 100644
--- a/src/gpu/gl/GrGLIndexBuffer.h
+++ b/src/gpu/gl/GrGLIndexBuffer.h
@@ -45,7 +45,7 @@
 
 private:
     GrGpuGL* getGpuGL() const {
-        GrAssert(this->isValid());
+        SkASSERT(this->isValid());
         return (GrGpuGL*)(this->getGpu());
     }