Enable /Zc:StrictStrings on release builds

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 944dcb6eebb257bf06dda0140bcd09e45face065..d64aabeee951ffcef5171678454cfe741d618a31 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -2882,6 +2882,9 @@
           'NTDDI_VERSION=0x06030000',
           # This is required for ATL to use XP-safe versions of its functions.
           '_USING_V110_SDK71_',
+          # This is required to avoid including mshtml.h, which is wasteful
+          # and not StrictStrings compliant.
+          '_ATL_NO_HOSTING'
         ],
         'include_dirs': [
           '<(DEPTH)/third_party/wtl/include',
@@ -3531,6 +3534,8 @@
             'AdditionalOptions': [
                 '/d2Zi+',  # Improve debugging of Release builds.
                 '/Zc:inline',  # Remove unreferenced COMDAT (faster links).
+                # Prohibit assigning string constants to non-const char*
+                '/Zc:strictStrings',
                 '<@(win_release_extra_cflags)',
             ],
           },