[Android][WebSignin] Put |No thanks| text behind flag

This CL adds a new flag param for web sign-in flow and put the text
|No thanks| behind the flag.

Bug: 1153253
Change-Id: I1403c3790cc954a24d2dce2f9cfacb7fd8fa7a9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2563269
Commit-Queue: Alice Wang <[email protected]>
Reviewed-by: Mihai Sardarescu <[email protected]>
Cr-Commit-Position: refs/heads/master@{#832316}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 7e0a166..b1e7fe67 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -838,6 +838,9 @@
 extern const char kMobileIdentityConsistencyName[];
 extern const char kMobileIdentityConsistencyDescription[];
 
+extern const char kMobileIdentityConsistencyVarName[];
+extern const char kMobileIdentityConsistencyVarDescription[];
+
 extern const char kMouseSubframeNoImplicitCaptureName[];
 extern const char kMouseSubframeNoImplicitCaptureDescription[];