Remove hasMixedSamples() from GrPipelineBuilder

src/gpu/GrPipelineBuilder.cpp

Index: src/gpu/GrPipelineBuilder.cpp
diff --git a/src/gpu/GrPipelineBuilder.cpp b/src/gpu/GrPipelineBuilder.cpp
index 252c26577e5f15c65349b1cd87cde0b5772911d6..1fd568e3664cb41ad2f064448b6c5bdd668075a6 100644
--- a/src/gpu/GrPipelineBuilder.cpp
+++ b/src/gpu/GrPipelineBuilder.cpp
@@ -55,11 +55,9 @@ GrPipelineBuilder::GrPipelineBuilder(const GrPaint& paint, GrRenderTarget* rt, c
 bool GrPipelineBuilder::willXPNeedDstTexture(const GrCaps& caps,
                                              const GrPipelineOptimizations& optimizations) const {
     if (this->getXPFactory()) {
-        return this->getXPFactory()->willNeedDstTexture(caps, optimizations,
-                                                        this->hasMixedSamples());
+        return this->getXPFactory()->willNeedDstTexture(caps, optimizations);
     }
-    return GrPorterDuffXPFactory::SrcOverWillNeedDstTexture(caps, optimizations,
-                                                            this->hasMixedSamples());
+    return GrPorterDuffXPFactory::SrcOverWillNeedDstTexture(caps, optimizations);
 }
 
 void GrPipelineBuilder::AutoRestoreFragmentProcessorState::set(