Remove bad const from disk_cache::Backend interface.

http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Use_of_const tells me not to use const where it's confusing. The instances of const removed by this CL are definitely confusing since they aren't even part of the interfaces they're written in. Worse yet, our Windows compiler gives errors if you override without matching them.

This issue is upstream of https://codereview.chromium.org/12192005/ (Add simple cache backend), and must land before it so as to not break the windows build.

R=rvargas@chromium.org
BUG=None

Review URL: https://chromiumcodereview.appspot.com/12207120

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182065 0039d316-1c4b-4281-b951-d872f2087c98

net/disk_cache/backend_impl.h

@@ -73,9 +73,9 @@ class NET_EXPORT_PRIVATE BackendImpl : public Backend {
   int SyncCreateEntry(const std::string& key, Entry** entry);
   int SyncDoomEntry(const std::string& key);
   int SyncDoomAllEntries();
-  int SyncDoomEntriesBetween(const base::Time initial_time,
-                             const base::Time end_time);
-  int SyncDoomEntriesSince(const base::Time initial_time);
+  int SyncDoomEntriesBetween(base::Time initial_time,
+                             base::Time end_time);
+  int SyncDoomEntriesSince(base::Time initial_time);
   int SyncOpenNextEntry(void** iter, Entry** next_entry);
   int SyncOpenPrevEntry(void** iter, Entry** prev_entry);
   void SyncEndEnumeration(void* iter);
@@ -269,10 +269,10 @@ class NET_EXPORT_PRIVATE BackendImpl : public Backend {
   virtual int DoomEntry(const std::string& key,
                         const CompletionCallback& callback) OVERRIDE;
   virtual int DoomAllEntries(const CompletionCallback& callback) OVERRIDE;
-  virtual int DoomEntriesBetween(const base::Time initial_time,
-                                 const base::Time end_time,
+  virtual int DoomEntriesBetween(base::Time initial_time,
+                                 base::Time end_time,
                                  const CompletionCallback& callback) OVERRIDE;
-  virtual int DoomEntriesSince(const base::Time initial_time,
+  virtual int DoomEntriesSince(base::Time initial_time,
                                const CompletionCallback& callback) OVERRIDE;
   virtual int OpenNextEntry(void** iter, Entry** next_entry,
                             const CompletionCallback& callback) OVERRIDE;

net/disk_cache/disk_cache.h

@@ -106,14 +106,14 @@ class NET_EXPORT Backend {
   // either direction by using null Time values for either argument. The return
   // value is a net error code. If this method returns ERR_IO_PENDING, the
   // |callback| will be invoked when the operation completes.
-  virtual int DoomEntriesBetween(const base::Time initial_time,
-                                 const base::Time end_time,
+  virtual int DoomEntriesBetween(base::Time initial_time,
+                                 base::Time end_time,
                                  const CompletionCallback& callback) = 0;
 
   // Marks all entries accessed since |initial_time| for deletion. The return
   // value is a net error code. If this method returns ERR_IO_PENDING, the
   // |callback| will be invoked when the operation completes.
-  virtual int DoomEntriesSince(const base::Time initial_time,
+  virtual int DoomEntriesSince(base::Time initial_time,
                                const CompletionCallback& callback) = 0;
 
   // Enumerates the cache. Initialize |iter| to NULL before calling this method

net/disk_cache/mem_backend_impl.h

@@ -71,10 +71,10 @@ class NET_EXPORT_PRIVATE MemBackendImpl : public Backend {
   virtual int DoomEntry(const std::string& key,
                         const CompletionCallback& callback) OVERRIDE;
   virtual int DoomAllEntries(const CompletionCallback& callback) OVERRIDE;
-  virtual int DoomEntriesBetween(const base::Time initial_time,
-                                 const base::Time end_time,
+  virtual int DoomEntriesBetween(base::Time initial_time,
+                                 base::Time end_time,
                                  const CompletionCallback& callback) OVERRIDE;
-  virtual int DoomEntriesSince(const base::Time initial_time,
+  virtual int DoomEntriesSince(base::Time initial_time,
                                const CompletionCallback& callback) OVERRIDE;
   virtual int OpenNextEntry(void** iter, Entry** next_entry,
                             const CompletionCallback& callback) OVERRIDE;

net/http/mock_http_cache.h

@@ -106,11 +106,11 @@ class MockDiskCache : public disk_cache::Backend {
                         const net::CompletionCallback& callback) OVERRIDE;
   virtual int DoomAllEntries(const net::CompletionCallback& callback) OVERRIDE;
   virtual int DoomEntriesBetween(
-      const base::Time initial_time,
-      const base::Time end_time,
+      base::Time initial_time,
+      base::Time end_time,
       const net::CompletionCallback& callback) OVERRIDE;
   virtual int DoomEntriesSince(
-      const base::Time initial_time,
+      base::Time initial_time,
       const net::CompletionCallback& callback) OVERRIDE;
   virtual int OpenNextEntry(void** iter, disk_cache::Entry** next_entry,
                             const net::CompletionCallback& callback) OVERRIDE;