Cleanup: Go with SkDebugf instead of GrPrintf.

Since GrPrintf is just defined to SkDebugf, we can go with the later
directly.

BUG=None
TEST=None
R=bsalomon@google.com

Review URL: https://codereview.chromium.org/695663003
diff --git a/src/gpu/GrAARectRenderer.cpp b/src/gpu/GrAARectRenderer.cpp
index d4aad40..ae8a06c 100644
--- a/src/gpu/GrAARectRenderer.cpp
+++ b/src/gpu/GrAARectRenderer.cpp
@@ -433,7 +433,7 @@
 
     GrDrawTarget::AutoReleaseGeometry geo(target, 8, 0);
     if (!geo.succeeded()) {
-        GrPrintf("Failed to get space for vertices!\n");
+        SkDebugf("Failed to get space for vertices!\n");
         return;
     }
 
@@ -445,7 +445,7 @@
     }
     GrIndexBuffer* indexBuffer = fAAFillRectIndexBuffer;
     if (NULL == indexBuffer) {
-        GrPrintf("Failed to create index buffer!\n");
+        SkDebugf("Failed to create index buffer!\n");
         return;
     }
 
@@ -606,7 +606,7 @@
 
     GrDrawTarget::AutoReleaseGeometry geo(target, 4, 0);
     if (!geo.succeeded()) {
-        GrPrintf("Failed to get space for vertices!\n");
+        SkDebugf("Failed to get space for vertices!\n");
         return;
     }
 
@@ -653,7 +653,7 @@
 
     GrDrawTarget::AutoReleaseGeometry geo(target, 4, 0);
     if (!geo.succeeded()) {
-        GrPrintf("Failed to get space for vertices!\n");
+        SkDebugf("Failed to get space for vertices!\n");
         return;
     }
 
@@ -785,12 +785,12 @@
 
     GrDrawTarget::AutoReleaseGeometry geo(target, totalVertexNum, 0);
     if (!geo.succeeded()) {
-        GrPrintf("Failed to get space for vertices!\n");
+        SkDebugf("Failed to get space for vertices!\n");
         return;
     }
     GrIndexBuffer* indexBuffer = this->aaStrokeRectIndexBuffer(miterStroke);
     if (NULL == indexBuffer) {
-        GrPrintf("Failed to create index buffer!\n");
+        SkDebugf("Failed to create index buffer!\n");
         return;
     }