Remove uniqueID from all filter serialization.

src/effects/SkMergeImageFilter.cpp

Index: src/effects/SkMergeImageFilter.cpp
diff --git a/src/effects/SkMergeImageFilter.cpp b/src/effects/SkMergeImageFilter.cpp
index 7034e158e5ef48e95d49007c180f09bee1443a05..f68d9133782ea25ad70b1019ef09e158cbd33506 100755
--- a/src/effects/SkMergeImageFilter.cpp
+++ b/src/effects/SkMergeImageFilter.cpp
@@ -42,9 +42,8 @@ void SkMergeImageFilter::initModes(const SkXfermode::Mode modes[]) {
 
 SkMergeImageFilter::SkMergeImageFilter(SkImageFilter* filters[], int count,
                                        const SkXfermode::Mode modes[],
-                                       const CropRect* cropRect,
-                                       uint32_t uniqueID)
-  : INHERITED(count, filters, cropRect, uniqueID) {
+                                       const CropRect* cropRect)
+  : INHERITED(count, filters, cropRect) {
     SkASSERT(count >= 0);
     this->initModes(modes);
 }
@@ -128,9 +127,9 @@ SkFlattenable* SkMergeImageFilter::CreateProc(SkReadBuffer& buffer) {
         if (!buffer.isValid()) {
             return NULL;
         }
-        return Create(common.inputs(), count, modes.get(), &common.cropRect(), common.uniqueID());
+        return Create(common.inputs(), count, modes.get(), &common.cropRect());
     }
-    return Create(common.inputs(), count, NULL, &common.cropRect(), common.uniqueID());
+    return Create(common.inputs(), count, NULL, &common.cropRect());
 }
 
 void SkMergeImageFilter::flatten(SkWriteBuffer& buffer) const {