[Fetch] Support various operations after reading data partially.

Source/modules/serviceworkers/Cache.cpp

Index: Source/modules/serviceworkers/Cache.cpp
diff --git a/Source/modules/serviceworkers/Cache.cpp b/Source/modules/serviceworkers/Cache.cpp
index 5a1a5eac12fff23ec959457db8c4faea461f6b1c..22e7ba732fa8bb5d4147a25470ff9bbf035bfdaf 100644
--- a/Source/modules/serviceworkers/Cache.cpp
+++ b/Source/modules/serviceworkers/Cache.cpp
@@ -373,12 +373,7 @@ ScriptPromise Cache::putImpl(ScriptState* scriptState, Request* request, Respons
     const ScriptPromise promise = resolver->promise();
     if (BodyStreamBuffer* buffer = response->internalBuffer()) {
         if (buffer == response->buffer() && response->streamAccessed()) {

[horo, 2015/03/20 02:28:54]

nit: we can remove brackets.

[yhirano, 2015/03/20 03:24:49]

Done.

-            bool dataLost = false;
-            buffer = response->createDrainingStream(&dataLost);
-            if (dataLost) {
-                resolver->reject(DOMException::create(NotSupportedError, "Storing the Response which .body is partially read is not supported."));
-                return promise;
-            }
+            buffer = response->createDrainingStream();
         }
         // If the response body type is stream, read the all data and create the
         // blob handle and dispatch the put batch asynchronously.