Bug Fix: Desktop Capture Picker Window

We used "[Extension] is sharing the content of your screen ...", and we should use plural form for "content".

This CL fixes the bug.

BUG=644852

Review-Url: https://codereview.chromium.org/2319163002
Cr-Commit-Position: refs/heads/master@{#417096}

chrome/app/generated_resources.grd

@@ -13874,7 +13874,7 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@gmail.com</ex
         <ph name="APP_NAME">$1<ex>Google Hangouts</ex></ph> wants to share the contents of your screen. Choose what you'd like to share.
       </message>
       <message name="IDS_DESKTOP_MEDIA_PICKER_TEXT_DELEGATED" desc="Text for the window picker dialog shown when desktop capture is requested by an app to be used by a tab.">
-        <ph name="APP_NAME">$1<ex>Google Hangouts</ex></ph> wants to share the content of your screen with <ph name="TARGET_NAME">$2<ex>https://google.com</ex></ph>. Choose what you'd like to share.
+        <ph name="APP_NAME">$1<ex>Google Hangouts</ex></ph> wants to share the contents of your screen with <ph name="TARGET_NAME">$2<ex>https://google.com</ex></ph>. Choose what you'd like to share.
       </message>
       <message name="IDS_DESKTOP_MEDIA_PICKER_AUDIO_SHARE" desc="Text for the checkbox on the window picker dialog, when checked, audio will be shared, otherwise just video sharing">
         Share audio