docs: Change "ChromeOS" to "Chrome OS".

storage/browser/blob/README.md

 # Chrome's Blob Storage System Design
 
 Elaboration of the blob storage system in Chrome.
 
 # What are blobs?
 
 Please see the [FileAPI Spec](https://www.w3.org/TR/FileAPI/) for the full
 specification for Blobs, or [Mozilla's Blob documentation](
 https://developer.mozilla.org/en-US/docs/Web/API/Blob) for a description of how
 Blobs are used in the Web Platform in general. For the purposes of this
@@ skipping 63 matching lines @@
 optimistically include the blob data if the size is less than the maximimum IPC
 size.
 
 # Blob Storage Limits
 
 We calculate the storage limits [here](
 https://cs.chromium.org/chromium/src/storage/browser/blob/blob_memory_controller.cc?q=CalculateBlobStorageLimitsImpl&sq=package:chromium).
 
 **In-Memory Storage Limit**
 
-* If the architecture is x64 and NOT ChromeOS or Android: `2GB`
+* If the architecture is x64 and NOT Chrome OS or Android: `2GB`
 * Otherwise: `total_physical_memory / 5`
 
 **Disk Storage Limit**
 
-* If ChromeOS: `disk_size / 2`
+* If Chrome OS: `disk_size / 2`
 * If Android: `disk_size / 20`
 * Else: `disk_size / 10`
 
-Note: ChromeOS's disk is part of the user partition, which is separate from the
+Note: Chrome OS's disk is part of the user partition, which is separate from the
 system partition.
 
 **Minimum Disk Availability**
 
 We limit our disk limit to accomidate a minimum disk availability. The equation
 we use is:
 
 `min_disk_availability = in_memory_limit * 2`
 
 ## Example Limits
@@ skipping 235 matching lines @@
 
 The `BlobMemoryController` is responsable for:
 
 1. Determining storage quota limits for files and memory, including restricting
 file quota when disk space is low.
 2. Determining whether a blob can fit and the transportation strategy to use.
 3. Tracking memory quota.
 4. Tracking file quota and creating files.
 5. Accumulating and evicting old blob data to files to disk.