Chromecast: fix Android lint warnings, which are now build errors.

build/android/lint/suppressions.xml

 <?xml version="1.0" encoding="utf-8"?>
 <lint>
   <!--
 STOP! It looks like you want to suppress some lint errors:
 - Have you tried identifing the offending patch?
   Ask the author for a fix and/or revert the patch.
 - It is preferred to add suppressions in the code instead of
   sweeping it under the rug here. See:
 
     http://developer.android.com/tools/debugging/improving-w-lint.html
@@ skipping 84 matching lines @@
   </issue>
   <issue id="SetJavaScriptEnabled" severity="ignore"/>
   <issue id="UnusedResources">
     <!--
       TODO(pkotwicz): Re-enable after the chrome_java and chrome_staging_java
       targets have been merged. crbug.com/484934
     -->
     <ignore path="chrome/android/java/res" />
     <ignore path="content/shell/android/shell_apk/res/layout/content_shell_activity.xml" />
     <ignore path="content/shell/android/shell_apk/res/values/strings.xml" />
+    <ignore path="chromecast/browser/android/apk/res/values/strings.xml" />

[aurimas (slooooooooow), 2015/06/23 00:42:19]

Which values and strings are unused?

[gunsch, 2015/06/23 00:45:43]

None now (same thing I pinged you about over chat)---looked like it was a matter
of pointing to the wrong manifest.

+    <ignore path="chromecast/internal/shell/android/apk/res/values/strings.xml" />
   </issue>
   <issue id="SignatureOrSystemPermissions" severity="ignore"/>
   <issue id="UnusedAttribute" severity="ignore"/>
   <issue id="ViewConstructor" severity="ignore"/>
   <issue id="WrongCall" severity="ignore"/>
 </lint>