AutoFillProfile: Don't clobber data on self-assignment

chrome/browser/autofill/autofill_profile_unittest.cc

Index: chrome/browser/autofill/autofill_profile_unittest.cc
diff --git a/chrome/browser/autofill/autofill_profile_unittest.cc b/chrome/browser/autofill/autofill_profile_unittest.cc
index 3c500a3927b24a38f2703d1cd596556c46359082..033fa5705133e2c530b40b0cbd233f230bfdd56a 100644
--- a/chrome/browser/autofill/autofill_profile_unittest.cc
+++ b/chrome/browser/autofill/autofill_profile_unittest.cc
@@ -495,6 +495,22 @@ TEST(AutoFillProfileTest, MergeWith) {
   EXPECT_EQ(0, expected_b.Compare(*b));
 }
 
+TEST(AutoFillProfileTest, AssignmentOperator){
+  AutoFillProfile a, b;
+
+  // Result of assignment should be logically equal to the original profile.
+  autofill_test::SetProfileInfo(&a, "Billing", "Marion", "Mitchell", "Morrison",
+                                "marion@me.xyz", "Fox", "123 Zoo St.", "unit 5",
+                                "Hollywood", "CA", "91601", "US", "12345678910",
+                                "01987654321");
+  b = a;
+  EXPECT_TRUE(a == b);
+
+  // Assignment to self should not change the profile value.
+  a = a;
+  EXPECT_TRUE(a == b);
+}
+
 TEST(AutoFillProfileTest, Compare) {
   AutoFillProfile a, b;