Android: use grit target platform instead of define.

chrome/app/google_chrome_strings.grd

Index: chrome/app/google_chrome_strings.grd
diff --git a/chrome/app/google_chrome_strings.grd b/chrome/app/google_chrome_strings.grd
index 934310bffc9e2eece0e29a6cc31a3b504a84e090..3142ad5f2f603d21cc48f3cc8443d072abc07549 100644
--- a/chrome/app/google_chrome_strings.grd
+++ b/chrome/app/google_chrome_strings.grd
@@ -395,12 +395,12 @@ Google Chrome is unable to recover your settings.
       <message name="IDS_CRASH_RECOVERY_CONTENT" desc="Text content telling the user the browser has crashed.">
         Whoa! Google Chrome 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 Google Chrome 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 Google Chrome to save your password for this site?
         </message>
@@ -613,14 +613,14 @@ Google Chrome is unable to recover your settings.
       </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 Google Chrome 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 Google Chrome, 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 Google Chrome." translateable="false">
 Summary of memory used by Google Chrome. Since Google Chrome uses multiple processes, memory reflects aggregate memory used across all browser processes.
 
@@ -821,11 +821,11 @@ Signing in anyway will merge Chrome information like bookmarks, history, and oth
           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 Chrome menu &gt;