2 files changed, 5 insertions, 11 deletions
diff --git a/chrome/browser/extensions/extension_protocols.cc b/chrome/browser/extensions/extension_protocols.cc
index d09cdd1..8f6957d 100644
--- a/chrome/browser/extensions/extension_protocols.cc
+++ b/chrome/browser/extensions/extension_protocols.cc
@@ -40,12 +40,12 @@ FilePath GetPathForExtensionResource(const FilePath& extension_path,
   if (!net::FileURLToFilePath(file_url, &ret_val))
     return FilePath();
 
-  if (!file_util::AbsolutePath(&ret_val))
-    return FilePath();
-
   // Double-check that the path we ended up with is actually inside the
-  // extension root.
-  if (!extension_path.Contains(ret_val))
+  // extension root. We can do this with a simple prefix match because:
+  // a) We control the prefix on both sides, and they should match.
+  // b) GURL normalizes things like "../" and "//" before it gets to us.
+  if (ret_val.value().find(extension_path.value() +
+                           FilePath::kSeparators[0]) != 0)
     return FilePath();
 
   return ret_val;
diff --git a/chrome/browser/extensions/extension_protocols_unittest.cc b/chrome/browser/extensions/extension_protocols_unittest.cc
index 113b480..dee70a8 100644
--- a/chrome/browser/extensions/extension_protocols_unittest.cc
+++ b/chrome/browser/extensions/extension_protocols_unittest.cc
@@ -15,12 +15,8 @@ TEST(ExtensionProtocolsTest, GetPathForExtensionResource) {
             GetPathForExtensionResource(extension_path, "/foo/bar.gif").value());
   EXPECT_EQ(std::wstring(L"C:\\myextension\\"),
             GetPathForExtensionResource(extension_path, "/").value());
-  // TODO(aa): This one is a bit weird, but is what net::FileURLToFilePath()
-  // returns for this input. Investigate adding more validation.
   EXPECT_EQ(std::wstring(L"C:\\myextension\\c:\\foo.gif"),
             GetPathForExtensionResource(extension_path, "/c:/foo.gif").value());
-  EXPECT_EQ(std::wstring(L"C:\\myextension\\foo.gif"),
-            GetPathForExtensionResource(extension_path, "//foo.gif").value());
   EXPECT_EQ(std::wstring(L""),
             GetPathForExtensionResource(extension_path, "/../foo.gif").value());
 #else
@@ -29,8 +25,6 @@ TEST(ExtensionProtocolsTest, GetPathForExtensionResource) {
             GetPathForExtensionResource(extension_path, "/foo/bar.gif").value());
   EXPECT_EQ(std::wstring("/myextension/"),
             GetPathForExtensionResource(extension_path, "/").value());
-  EXPECT_EQ(std::wstring("/myextension/foo.gif"),
-            GetPathForExtensionResource(extension_path, "//foo.gif").value());
   EXPECT_EQ(std::wstring(""),
             GetPathForExtensionResource(extension_path, "/../foo.gif").value());
 #endif