[net] Better StopCaching() handling for HttpCache::Transaction.

net/http/partial_data.h

Index: net/http/partial_data.h
diff --git a/net/http/partial_data.h b/net/http/partial_data.h
index 649d4623e0120bea74d6701567723d64b25bf1c6..c5ff01a89e5963332eae3d69f202397ca3151876 100644
--- a/net/http/partial_data.h
+++ b/net/http/partial_data.h
@@ -78,6 +78,17 @@ class PartialData {
   // Sets the byte current range to start again at zero (for a truncated entry).
   void SetRangeToStartDownload();
 
+  // Switch state to assume that the remainder of the response will be furnished
+  // via a network reqeust. Subsequent calls to
+  // ShouldValidateCache()/PrepareCacheValidation() will act as if the remainder
+  // of the response is not present in the cache and should be fetched over the
+  // network with validation.
+  //
+  // Returns true on success and false on failure. Fails only if the entire
+  // response has already been furnished and there is no need for any additional
+  // network reqeusts.
+  bool SkipCacheForRemainder();
+
   // Returns true if the requested range is valid given the stored data.
   bool IsRequestedRangeOK();
 
@@ -120,9 +131,6 @@ class PartialData {
   bool initial_validation() const { return initial_validation_; }
 
  private:
-  // Returns the length to use when scanning the cache.
-  int GetNextRangeLen();
-
   // Completion routine for our callback.
   void GetAvailableRangeCompleted(int64* start, int result);
 
@@ -130,7 +138,7 @@ class PartialData {
   int64 current_range_end_;
   int64 cached_start_;
   int64 resource_size_;
-  int cached_min_len_;
+  int64 cached_min_len_;
   HttpByteRange byte_range_;  // The range requested by the user.
   // The clean set of extra headers (no ranges).
   HttpRequestHeaders extra_headers_;