Make form-not-secure controllable as its own separate Finch feature

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 22342906434f9646aa5b463d3414c7827ed9aee1..dfea05447f6eff297546c494a3ee75ae0a0e2375 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -92945,6 +92945,7 @@ value.
   <int value="-2143328006"
       label="enable-fill-on-account-select-no-highlighting"/>
   <int value="-2143113994" label="enable-ephemeral-apps-in-webstore"/>
+  <int value="-2134244069" label="HttpFormWarning:enabled"/>
   <int value="-2132591642" label="enable-input-view"/>
   <int value="-2122048316"
       label="DisplayPersistenceToggleInPermissionPrompts:enabled"/>
@@ -93001,6 +93002,7 @@ value.
   <int value="-1941852572" label="floating-virtual-keyboard"/>
   <int value="-1940806558" label="enable-syncfs-directory-operation"/>
   <int value="-1938263248" label="enable-extension-info-dialog"/>
+  <int value="-1937077699" label="http-form-warning"/>
   <int value="-1934673791" label="gl-composited-texture-quad-border"/>
   <int value="-1930720286" label="nacl-debug-mask"/>
   <int value="-1928198763" label="enable-async-dns"/>
@@ -93250,6 +93252,7 @@ value.
   <int value="-856915246" label="enable-new-audio-rendering-mixing-strategy"/>
   <int value="-856016114" label="NTPOfflinePages:disabled"/>
   <int value="-853594220" label="disable-new-avatar-menu"/>
+  <int value="-844537521" label="HttpFormWarning:disabled"/>
   <int value="-842438090" label="enable-md-feedback"/>
   <int value="-836123854" label="wallet-service-use-sandbox"/>
   <int value="-835672415" label="PointerEventV1SpecCapturing:disabled"/>