Iterate over multiple forms.

ios/chrome/browser/autofill/autofill_agent.mm

Index: ios/chrome/browser/autofill/autofill_agent.mm
diff --git a/ios/chrome/browser/autofill/autofill_agent.mm b/ios/chrome/browser/autofill/autofill_agent.mm
index 1cdc17b4ab9dedc05037cd1e0efb2629e1d8240b..280132ca6cf3cd3f72d54cb8d02708499cec3436 100644
--- a/ios/chrome/browser/autofill/autofill_agent.mm
+++ b/ios/chrome/browser/autofill/autofill_agent.mm
@@ -65,12 +65,14 @@ void GetFormAndField(autofill::FormData* form,
                      const std::string& fieldName,
                      const std::string& type) {
   DCHECK_GE(forms.size(), 1U);
-  *form = forms[0];
   const base::string16 fieldName16 = base::UTF8ToUTF16(fieldName);
-  for (const auto& currentField : form->fields) {
-    if (currentField.name == fieldName16) {
-      *field = currentField;
-      break;
+  for (const auto& currentForm : forms) {
+    for (const auto& currentField : currentForm.fields) {
+      if (currentField.name == fieldName16) {
+        *form = currentForm;
+        *field = currentField;
+        break;
+      }
     }
   }
   if (field->SameFieldAs(autofill::FormFieldData()))
@@ -538,7 +540,7 @@ void GetFormAndField(autofill::FormData* form,
   // AutofillManager for suggestions.
   __weak AutofillAgent* weakSelf = self;
   id completionHandler = ^(BOOL success, const FormDataVector& forms) {
-    if (success && forms.size() == 1) {
+    if (success && forms.size() >= 1) {
       [weakSelf queryAutofillWithForms:forms
                                  field:fieldName
                                   type:type
@@ -743,7 +745,7 @@ void GetFormAndField(autofill::FormData* form,
 
   __weak AutofillAgent* weakSelf = self;
   id completionHandler = ^(BOOL success, const FormDataVector& forms) {
-    if (success && forms.size() == 1) {
+    if (success && forms.size() >= 1) {
       [weakSelf processFormActivityExtractedData:forms
                                        fieldName:fieldNameCopy
                                             type:typeCopy