Add /Zc:sizedDealloc- to work around VS 2015 bug

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index e3cd91d0a23a490f4994b7221053b2859533b95e..0e2bd07d65ecff985d45c91cb8b067287660d472 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -119,6 +119,11 @@ config("compiler") {
       "/bigobj",  # Some of our files are bigger than the regular limits.
     ]
 
+    if (visual_studio_version == "2015") {
+      # Work around crbug.com/526851, bug in VS 2015 RTM compiler
+      cflags += [ "/Zc:sizedDealloc-" ]
+    }
+
     # Force C/C++ mode for the given GN detected file type. This is necessary
     # for precompiled headers where the same source file is compiled in both
     # modes.