Fix Opt-in UI overlay text issues.

1. Fix text size overflow issue for OOBE opt-in session.
2. Fix learn more text style inconstancy.

TBR=xiyuan@chromium.org

Bug: 907021
Test: Manual
Change-Id: I6bd7ea9036a9bb89a139e02a2c1c15b33d3a1f60
Reviewed-on: https://chromium-review.googlesource.com/c/1345429
Commit-Queue: Long Cheng <lgcheng@google.com>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610173}

chrome/app/chromeos_strings.grdp

@@ -3043,7 +3043,7 @@
     <ph name="BEGIN_PARAGRAPH2">&lt;p&gt;</ph>You can turn off Location by turning off the main Location setting on this device. You can also turn off the use of Wi-Fi, mobile networks, and sensors for location in location settings.<ph name="END_PARAGRAPH2">&lt;/p&gt;</ph>
   </message>
   <message name="IDS_ARC_OPT_IN_LEARN_MORE_PAI_SERVICE" desc="Message shown in pop up overlay dialog when user clicks learn more play auto install services.">
-    To remove apps, go to Settings &gt; Google Play Store &gt; Manage Android preferences &gt; Apps or Application manager. Then tap the app you want to uninstall (you may need to swipe right or left to find the app). Then tap Uninstall or Disable.
+    <ph name="BEGIN_PARAGRAPH1">&lt;p&gt;</ph>To remove apps, go to Settings &gt; Google Play Store &gt; Manage Android preferences &gt; Apps or Application manager. Then tap the app you want to uninstall (you may need to swipe right or left to find the app). Then tap Uninstall or Disable.<ph name="END_PARAGRAPH1">&lt;/p&gt;</ph>
   </message>
   <message name="IDS_ARC_OPT_IN_PRIVACY_POLICY_LINK" desc="Text of the Link to Goolge Privacy Policy in opt-in dialog">
     Google privacy policy

chrome/browser/resources/chromeos/login/screen_arc_terms_of_service.css

@@ -15,8 +15,8 @@
 
 #arc-tos-overlay-content-text {
   box-sizing: border-box;
-  height: 200px;
   margin: auto;
+  min-height: 200px;
   padding: 24px 8px 8px 8px;
   width: 100%;
 }