Content verification: Don't fail on non-existence.

extensions/browser/content_hash_reader.cc

Index: extensions/browser/content_hash_reader.cc
diff --git a/extensions/browser/content_hash_reader.cc b/extensions/browser/content_hash_reader.cc
index c1e6e95642caba875dd3115abf413eb6a120219c..1c9ae97c62a1602022435057313f3bcf198d9b0d 100644
--- a/extensions/browser/content_hash_reader.cc
+++ b/extensions/browser/content_hash_reader.cc
@@ -35,6 +35,7 @@ ContentHashReader::ContentHashReader(const std::string& extension_id,
       relative_path_(relative_path),
       key_(key),
       status_(NOT_INITIALIZED),
+      content_exists_(false),
       have_verified_contents_(false),
       have_computed_hashes_(false),
       block_size_(0) {
@@ -50,6 +51,13 @@ bool ContentHashReader::Init() {
   base::FilePath verified_contents_path =
       file_util::GetVerifiedContentsPath(extension_root_);
 
+  // Check that this is a valid resource to verify (i.e., it exists).
+  base::FilePath content_path = extension_root_.Append(relative_path_);
+  if (!base::PathExists(content_path))
+    return false;
+
+  content_exists_ = true;
+
   if (!base::PathExists(verified_contents_path))
     return false;