**STILLBAKING** Decouple disk cache tests from backends.

net/disk_cache/disk_cache_test_util.h

Index: net/disk_cache/disk_cache_test_util.h
diff --git a/net/disk_cache/disk_cache_test_util.h b/net/disk_cache/disk_cache_test_util.h
index ad6b6ac94145cf3875525ee432fd4ff457dcc796..1209174513857927d4881c4fd4b994cbac227ca8 100644
--- a/net/disk_cache/disk_cache_test_util.h
+++ b/net/disk_cache/disk_cache_test_util.h
@@ -13,6 +13,15 @@
 #include "base/tuple.h"
 #include "build/build_config.h"
 
+// Disables a parameterized test if a quirk condition is met.
+#define TEST_DISABLED_IF(cond) \
+  do { \
+    if (cond) { \
+      LOG(INFO) << "Test is disabled."; \
+      return; \
+    } \
+  } while (false)
+
 // Re-creates a given test file inside the cache test folder.
 bool CreateCacheTestFile(const base::FilePath& name);
 
@@ -25,10 +34,6 @@ void CacheTestFillBuffer(char* buffer, size_t len, bool no_nulls);
 // Generates a random key of up to 200 bytes.
 std::string GenerateKey(bool same_length);
 
-// Returns true if the cache is not corrupt.
-bool CheckCacheIntegrity(const base::FilePath& path, bool new_eviction,
-                         uint32 mask);
-
 // -----------------------------------------------------------------------
 
 // Simple helper to deal with the message loop on a test.