drive: Rename 'gdata' namespace to 'drive' in chrome/browser/chromeos/drive

chrome/browser/chromeos/drive/drive_cache.h

Index: chrome/browser/chromeos/drive/drive_cache.h
diff --git a/chrome/browser/chromeos/drive/drive_cache.h b/chrome/browser/chromeos/drive/drive_cache.h
index a6b59e41330606e2423021f42221b276f6f785f1..46a5d443d723adc0c50d35199bc8348a467ec07e 100644
--- a/chrome/browser/chromeos/drive/drive_cache.h
+++ b/chrome/browser/chromeos/drive/drive_cache.h
@@ -23,7 +23,7 @@ class SequencedTaskRunner;
 
 }  // namespace base
 
-namespace gdata {
+namespace drive {
 
 class DriveCacheEntry;
 class DriveCacheMetadata;
@@ -464,6 +464,6 @@ class FreeDiskSpaceGetterInterface {
 void SetFreeDiskSpaceGetterForTesting(
     FreeDiskSpaceGetterInterface* getter);
 
-}  // namespace gdata
+}  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_CACHE_H_