bug#39301: bump up img cache size back up to 2M. Now have way to limit other

resources. pnunn r:sfraser@netscape.com

gfx/src/nsImageManager.cpp

@@ -59,7 +59,7 @@ ImageManagerImpl::ImageManagerImpl()
   NS_INIT_REFCNT();
   NS_NewImageSystemServices(getter_AddRefs(mSS));
   IL_Init(mSS);
-  IL_SetCacheSize(1024L * 1024L);
+  IL_SetCacheSize(2048L * 1024L);
 }
 
 ImageManagerImpl::~ImageManagerImpl()