Bug 1475500 - Reduce maximum favicon size from 256 to 192px. r=adw

MozReview-Commit-ID: KXeGegF9Pu9

--HG--
extra : rebase_source : 9d12e228ea47b333e046fc1b1040daee3c332758

toolkit/components/places/nsFaviconService.h

@@ -25,8 +25,9 @@
 #include "FaviconHelpers.h"
 
 // The target dimension in pixels for favicons we store, in reverse order.
-static uint16_t sFaviconSizes[8] = {
-  256, 192, 144, 96, 64, 48, 32, 16
+// When adding/removing sizes from here, make sure to update the vector size.
+static uint16_t sFaviconSizes[7] = {
+  192, 144, 96, 64, 48, 32, 16
 };
 
 // forward class definitions