Fix potential bug in FastSharedBufferReader::getConsecutiveData

Source/platform/SharedBuffer.h

Index: Source/platform/SharedBuffer.h
diff --git a/Source/platform/SharedBuffer.h b/Source/platform/SharedBuffer.h
index 70946e7d8217059d53e8c5bbed0cb9788e32323e..4b1834e7330e8a93d7d9c12ff92d79242bd01d99 100644
--- a/Source/platform/SharedBuffer.h
+++ b/Source/platform/SharedBuffer.h
@@ -39,6 +39,8 @@ namespace blink {
 
 class PLATFORM_EXPORT SharedBuffer : public RefCounted<SharedBuffer> {
 public:
+    static const unsigned kSegmentSize = 0x1000;
+
     static PassRefPtr<SharedBuffer> create() { return adoptRef(new SharedBuffer); }
     static PassRefPtr<SharedBuffer> create(size_t size) { return adoptRef(new SharedBuffer(size)); }
     static PassRefPtr<SharedBuffer> create(const char* c, int i) { return adoptRef(new SharedBuffer(c, i)); }