Remove titlecasing for payments-dialog titles

Keeps section labels in conditional titlecase as they can be displayed
as the bubble heading and are properly titles within the dialog.

It also replaces 'Your payment' with 'Review your payment' to provide a
full sentence.

Bug: chromium:810111, chromium:812362
Change-Id: I4db492f772339e5a32fb92e1f3027d9aa047a67b
Reviewed-on: https://chromium-review.googlesource.com/935748Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539318}

components/payments_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
 
-  <!-- Titles and buttons which are title-cased on certain platforms. Make sure to keep the title-cased and sentence-cased variants in sync. -->
+  <!-- Dialog titles, sentence-cased -->
+  <message name="IDS_PAYMENTS_TITLE" desc="Title of the dialog that presents a request for payment for some good or service. Sentence-cased.">
+    Review your payment
+  </message>
+  <message name="IDS_PAYMENTS_ERROR_MESSAGE_DIALOG_TITLE" desc="The title of the dialog that informs the user that there is error in verifying and charging the payment.">
+    Payment not completed
+  </message>
 
+  <!-- Section labels and buttons which are title-cased on certain platforms. Make sure to keep the title-cased and sentence-cased variants in sync. -->
 
   <!-- General titles, sentence-cased -->
   <if expr="not use_titlecase">
-    <message name="IDS_PAYMENTS_TITLE" desc="Title of the dialog that presents a request for payment for some good or service. Sentence-cased.">
-      Your payment
-    </message>
     <message name="IDS_PAYMENTS_METHOD_OF_PAYMENT_LABEL" desc="The title for the section that lets the user select the method of payment. Sentence-cased." formatter_data="android_java">
       Payment method
     </message>
@@ -75,9 +79,6 @@
   </if>  <!-- not use_titlecase -->
   <!-- General Titles, Title-Cased -->
   <if expr="use_titlecase">
-    <message name="IDS_PAYMENTS_TITLE" desc="Title of the dialog that presents a request for payment for some good or service. Title-Cased.">
-      Your Payment
-    </message>
     <message name="IDS_PAYMENTS_METHOD_OF_PAYMENT_LABEL" desc="The title for the section that lets the user select the method of payment. Title-Cased.">
       Payment Method
     </message>
@@ -285,9 +286,6 @@
     </message>
     <message name="IDS_PAYMENTS_PROCESSING_MESSAGE" desc="The text that informs the user that payment is being processed. Sentence-cased.">
       Processing
-    </message>
-    <message name="IDS_PAYMENTS_ERROR_MESSAGE_DIALOG_TITLE" desc="The title of the dialog that informs the user that there is error in verifying and charging the payment. Sentence-cased.">
-      Payment not completed
     </message>
      <message name="IDS_PAYMENTS_CHECKING_OPTION" desc="Text explaining that the option the user selected is being checked and verified. Sentence-cased." formatter_data="android_java">
       Checking
@@ -339,9 +337,6 @@
     </message>
     <message name="IDS_PAYMENTS_PROCESSING_MESSAGE" desc="The text that informs the user that payment is being processed. Title-Cased.">
       Processing
-    </message>
-    <message name="IDS_PAYMENTS_ERROR_MESSAGE_DIALOG_TITLE" desc="The title of the dialog that informs the user that there is error in verifying and charging the payment. Title-Cased.">
-      Payment Not Completed
     </message>
      <message name="IDS_PAYMENTS_CHECKING_OPTION" desc="Text explaining that the option the user selected is being checked and verified. Title-Cased." formatter_data="android_java">
       Checking