[aw] Change DEV_SUFFIX presubmit check to pattern

Change DEV_SUFFIX presubmit check to use the pattern
'\bDEV_SUFFIX\b' instead of searching for the raw
string 'DEV_SUFFIX'. This can potentially avoid some
false positives.

boundary_interfaces no longer triggers a false positive.

Bug: 921784
Test: Locally adding SOME_DEV_SUFFIX or DEV_SUFFIX_SOME in
Change-Id: I5a9d6b04182ec8ebcbb3e6d9eba3f757da0c0847
Reviewed-on: https://chromium-review.googlesource.com/c/1436032
Commit-Queue: Laís Minchillo <laisminchillo@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626976}

android_webview/support_library/PRESUBMIT.py

@@ -63,11 +63,14 @@ def _CheckFeatureDevSuffix(input_api, output_api):
   right place to use it is SupportLibWebViewChromiumFactory.
   """
 
+  pattern = input_api.re.compile(r'\bDEV_SUFFIX\b')
+
   problems = []
   filt = lambda f: 'boundary_interfaces' in f.LocalPath()
   for f in input_api.AffectedFiles(file_filter=filt):
     for line_num, line in f.ChangedContents():
-      if 'DEV_SUFFIX' in line:
+      m = pattern.search(line)
+      if m:
         problems.append('  %s:%d\n    %s\n' % (f.LocalPath(), line_num, line))
 
   if not problems: