Update CM API IDL to use SecureContext

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 866a70e3c673610dab0e7f5b177dea7a35020a68..ed8c82852fbb083c4db89dd1d29ab44ec89f93d4 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -103391,7 +103391,6 @@ from previous Chrome versions.
   <int value="-1212273428" label="enable-experimental-app-list"/>
   <int value="-1212167260" label="disable-app-window-cycling"/>
   <int value="-1208501269" label="AutofillScanThemeDialog:enabled"/>
-  <int value="-1205790119" label="CredentialManagementAPI:enabled"/>
   <int value="-1203955801" label="enable-password-change-support:disabled"/>
   <int value="-1203742042" label="enable-gesture-selection"/>
   <int value="-1201183153" label="enable-centered-app-list"/>
@@ -103660,7 +103659,6 @@ from previous Chrome versions.
   <int value="-165756594" label="enable-touch-feedback"/>
   <int value="-159877930" label="MaterialDesignUserManager:disabled"/>
   <int value="-158549277" label="enable-embeddedsearch-api"/>
-  <int value="-158197254" label="enable-credential-manager-api"/>
   <int value="-152677714" label="AsmJsToWebAssembly:enabled"/>
   <int value="-147283486" label="enable-network-portal-notification"/>
   <int value="-146552997" label="enable-affiliation-based-matching"/>
@@ -104181,7 +104179,6 @@ from previous Chrome versions.
   <int value="1891210939" label="enable-blink-features"/>
   <int value="1892201400" label="enable-password-separated-signin-flow"/>
   <int value="1893317228" label="WebPayments:enabled"/>
-  <int value="1895587769" label="CredentialManagementAPI:disabled"/>
   <int value="1896456311" label="enable-password-save-in-page-navigation"/>
   <int value="1898231011" label="enable-native-notifications"/>
   <int value="1900529524" label="disable-touch-drag-drop"/>