Remove SignInSource from ShowSigninCommand.

ios/chrome/browser/signin/constants.h

Index: ios/chrome/browser/signin/constants.h
diff --git a/ios/chrome/browser/signin/constants.h b/ios/chrome/browser/signin/constants.h
index 2ff5f98785cb4d450f8e7f22394a420cea28e117..1b30eeabeddf7f11ebdabeeb90ff9f7074655e41 100644
--- a/ios/chrome/browser/signin/constants.h
+++ b/ios/chrome/browser/signin/constants.h
@@ -24,40 +24,6 @@ typedef enum {
   TIMED_OUT_FETCH_POLICY = -210,
 } AuthenticationErrorCode;
 
-// Enum is used to count the various sign in sources in the histogram
-// |Signin.IOSSignInSource|.
-typedef enum {
-  // Unspecified sign-in source. This includes sign in operations started from
-  // "Other Devices" and from the sync error infobar displayed for pre-SSO
-  // signed in users.
-  SIGN_IN_SOURCE_OTHER,
-  // Sign in operation was started from first run.
-  SIGN_IN_SOURCE_FIRST_RUN,
-  // Sign in operation was started from the SSO recall promo.
-  SIGN_IN_SOURCE_SSO_PROMO,
-  // Sign in operation was started from settings.
-  SIGN_IN_SOURCE_SETTINGS,
-  // Sign in operation was started from as a pre-requisite of share operation.
-  // Deprecated since M53.
-  SIGN_IN_SOURCE_SHARE_DEPRECATED,
-  // Sign in operation was started from as a pre-requisite of a print operation.
-  SIGN_IN_SOURCE_PRINT,
-  // Sign in operation was started from the re-sign in infobar.
-  SIGN_IN_SOURCE_RESIGN_IN_INFOBAR,
-  // Sign in operation was started from the Chrome to Device infobar.
-  SIGN_IN_SOURCE_CHROME_TO_DEVICE_INFOBAR,
-  // Sign in operation was started from the recent tabs panel.
-  SIGN_IN_SOURCE_RECENT_TABS,
-  // Sign in operation was started from the bookmarks promo panel.
-  SIGN_IN_SOURCE_BOOKMARKS_PROMO,
-  // Sign in operation was started from the Tab Switcher.
-  SIGN_IN_SOURCE_TAB_SWITCHER,
-  // NOTE: Add new sign in sources only immediately above this line. Also, make
-  // sure the enum list for histogram |Signin.IOSSignInSource| in
-  // uma/configs/chrome/histograms.xml is updated with any change in here.
-  SIGN_IN_SOURCE_COUNT
-} SignInSource;
-
 typedef enum {
   SHOULD_CLEAR_DATA_USER_CHOICE,
   SHOULD_CLEAR_DATA_CLEAR_DATA,