Revert of [Android] Temporarily suppress RTL start&end check error. (patchset...

Revert of [Android] Temporarily suppress RTL start&end check error. (patchset #1 id:1 of https://codereview.chromium.org/445753002/)

Reason for revert:
Android SDK fixed the issue, so we can convert back from warning to error.

Original issue's description:
> [Android] Temporarily suppress RTL start&end check error.
>
> The newest Android SDK had start&end attributes in non -v17 resources.
> Temporarily change the checking script from error to warning so that
> people can continue to work before it is fixed. This should be
> reverted once the issue is addressed
>
> BUG=None
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287711

TBR=newt@chromium.org,tedchoc@chromium.org,dfalcantara@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/555253004

Cr-Commit-Position: refs/heads/master@{#294038}

build/android/gyp/generate_v14_compatible_resources.py

@@ -226,7 +226,7 @@ def VerifyV14ResourcesInDir(input_dir, resource_type):
   don't use attributes that cause crashes on certain devices. Print an error if
   they have."""
   for input_filename in build_utils.FindInDirectory(input_dir, '*.xml'):
-    warning_message = ('warning : ' + input_filename + ' has an RTL attribute, '
+    exception_message = ('error : ' + input_filename + ' has an RTL attribute, '
                         'i.e., attribute that has "start" or "end" in its name.'
                         ' Pre-v17 resources should not include it because it '
                         'can cause crashes on certain devices. Please refer to '
@@ -234,10 +234,10 @@ def VerifyV14ResourcesInDir(input_dir, resource_type):
     dom = minidom.parse(input_filename)
     if resource_type in ('layout', 'xml'):
       if GenerateV14LayoutResourceDom(dom, input_filename, False):
-        print warning_message
+        raise Exception(exception_message)
     elif resource_type == 'values':
       if GenerateV14StyleResourceDom(dom, input_filename, False):
-        print warning_message
+        raise Exception(exception_message)
 
 
 def AssertNoDeprecatedAttributesInDir(input_dir, resource_type):