make allocPixels throw on failure

src/effects/SkBlurImageFilter.cpp

Index: src/effects/SkBlurImageFilter.cpp
diff --git a/src/effects/SkBlurImageFilter.cpp b/src/effects/SkBlurImageFilter.cpp
index d08209874bdad74be11d035fd8f2ac9cf976725d..8590400003eba2ffb8aae2eb255abcc00e207f0a 100644
--- a/src/effects/SkBlurImageFilter.cpp
+++ b/src/effects/SkBlurImageFilter.cpp
@@ -172,7 +172,7 @@ bool SkBlurImageFilter::onFilterImage(Proxy* proxy,
         return false;
     }
 
-    if (!dst->allocPixels(src.info().makeWH(srcBounds.width(), srcBounds.height()))) {
+    if (!dst->tryAllocPixels(src.info().makeWH(srcBounds.width(), srcBounds.height()))) {
         return false;
     }
     dst->getBounds(&dstBounds);
@@ -199,7 +199,7 @@ bool SkBlurImageFilter::onFilterImage(Proxy* proxy,
     }
 
     SkBitmap temp;
-    if (!temp.allocPixels(dst->info())) {
+    if (!temp.tryAllocPixels(dst->info())) {
         return false;
     }