Android: use grit target platform instead of define.

chrome/app/chromium_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are distribution specific.
 These strings will not be translated and only english versions will
 be available for now. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/chromium_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 454 matching lines @@
 
 Chromium is unable to recover your settings.
       </message>
       <!-- Crash Recovery Dialog -->
       <message name="IDS_CRASH_RECOVERY_TITLE" desc="Title of dialog shown when the browser crashes.">
         Chromium
       </message>
       <message name="IDS_CRASH_RECOVERY_CONTENT" desc="Text content telling the user the browser has crashed.">
         Whoa! Chromium has crashed. Relaunch now?
       </message>
-      <if expr="not pp_ifdef('android')">
+      <if expr="not is_android">
         <message name="IDS_PASSWORD_MANAGER_SAVE_PASSWORD_PROMPT" desc="Info bar message to save a password">
           Do you want Chromium to save your password?
         </message>
       </if>
-      <if expr="pp_ifdef('android')">
+      <if expr="is_android">
         <message name="IDS_PASSWORD_MANAGER_SAVE_PASSWORD_PROMPT" desc="Mobile: Info bar message to save a password">
           Do you want Chromium to save your password for this site?
         </message>
       </if>
       <message name="IDS_CANT_WRITE_USER_DIRECTORY_EXIT_BUTTON" desc="Text on button of dialog that closes Chrome if we can't create a directory for this user.">
         Exit Chromium
       </message>
       <message name="IDS_MACHINE_LEVEL_INSTALL_CONFLICT" desc="Error message to display when user tries to run user level Chromium even though machine level Chromium is already installed.">
         An administrator has installed Chromium on this system, and it is available for all users. The system-level Chromium will replace your user-level installation now.
       </message>
@@ skipping 191 matching lines @@
       <message name="IDS_SYSTEM_OBSOLETE_MESSAGE" desc="Message shown when your OS is no longer supported. This message is followed by a 'Learn more' link.">
          Chromium has stopped updating and no longer supports this version of your operating system.
       </message>
 
       <!-- Google API keys info bar -->
       <message name="IDS_MISSING_GOOGLE_API_KEYS" desc="Message shown when Google API keys are missing. This message is followed by a 'Learn more' link.">
         Google API keys are missing. Some functionality of Chromium will be disabled.
       </message>
 
       <!-- about:memory -->
-      <if expr="not pp_ifdef('android')">
+      <if expr="not is_android">
         <message name="IDS_MEMORY_USAGE_SUMMARY_DESC" desc="Describes the browser summary table in the about memory page, which shows memory usage for Chromium and any other active browsers." translateable="false">
 Summary of memory used by currently active browsers. For browsers which use multiple processes, memory reflects aggregate memory used across all browser processes.
 
 For Chromium, processes used to display diagnostics information (such as this "about:memory") are excluded.
         </message>
       </if>
-      <if expr="pp_ifdef('android')">
+      <if expr="is_android">
         <message name="IDS_MEMORY_USAGE_SUMMARY_DESC" desc="Describes the browser summary table in the about memory page, which shows memory usage for Chromium." translateable="false">
 Summary of memory used by Chromium. Since Chromium uses multiple processes, memory reflects aggregate memory used across all browser processes.
 
 For Chromium, processes used to display diagnostics information (such as this "about:memory") are excluded.
         </message>
       </if>
 
       <!-- About Chrome page -->
       <if expr="not pp_ifdef('chromeos')">
         <message name="IDS_UPGRADE_SUCCESSFUL_RELAUNCH" desc="Status label: Successfully updated Chromium">
@@ skipping 180 matching lines @@
         Allow Chromium to access the network in your firewall or antivirus
         settings.
       </message>
       <if expr="is_macosx and not pp_ifdef('ios')">
         <message name="IDS_ERRORPAGES_SUGGESTION_PROXY_DISABLE_PLATFORM" desc="Mac OSX instructions for disabling use of a proxy server.">
           Go to
           Applications &gt; System Preferences &gt; Network &gt; Advanced &gt; Proxies
           and deselect any proxies that have been selected.
         </message>
       </if>
-      <if expr="pp_ifdef('android') or pp_ifdef('ios')">
+      <if expr="is_android or pp_ifdef('ios')">
         <message name="IDS_ERRORPAGES_SUGGESTION_PROXY_DISABLE_PLATFORM" desc="Instructions for disabling use of a proxy server (leave empty for Android and iOS).">
         </message>
       </if>
-      <if expr="not pp_ifdef('chromeos') and is_posix and not is_macosx and not pp_ifdef('android') and not pp_ifdef('ios')">
+      <if expr="not pp_ifdef('chromeos') and is_posix and not is_macosx and not is_android and not pp_ifdef('ios')">
         <message name="IDS_ERRORPAGES_SUGGESTION_PROXY_DISABLE_PLATFORM" desc="Linux instructions for disabling use of a proxy server.">
           Go to
           the Chromium menu &gt;
           <ph name="SETTINGS_TITLE">&lt;span jscontent="settingsTitle"&gt;&lt;/span&gt;<ex>Settings</ex></ph>
           &gt;
           <ph name="ADVANCED_TITLE">&lt;span jscontent="advancedTitle"&gt;&lt;/span&gt;<ex>Under the Hood</ex></ph>
           &gt;
           <ph name="PROXIES_TITLE">&lt;span jscontent="proxyTitle"&gt;&lt;/span&gt;<ex>Change proxy settings...</ex></ph>
           and make sure your configuration is set to &quot;no proxy&quot; or &quot;direct.&quot;
         </message>
@@ skipping 44 matching lines @@
 
       <!-- Chrome OS OOBE Terms of Service screen-->
       <if expr="pp_ifdef('chromeos')">
         <message name="IDS_TERMS_OF_SERVICE_SCREEN_SUBHEADING" desc="Subheading at the top of the Terms of Service screen.">
           <ph name="DOMAIN">$1<ex>example.com</ex></ph> requires that you read and accept the following Terms of Service before using this device. These terms do not expand, modify or limit the Chromium OS Terms.
         </message>
       </if>
     </messages>
   </release>
 </grit>