Remove the command buffer method glGetImageivCHROMIUM.

gpu/GLES2/extensions/CHROMIUM/CHROMIUM_gpu_memory_buffer_image.txt

Index: gpu/GLES2/extensions/CHROMIUM/CHROMIUM_gpu_memory_buffer_image.txt
diff --git a/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_gpu_memory_buffer_image.txt b/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_gpu_memory_buffer_image.txt
index 7af2e7f7819f7265280b9e140982f632acb20231..93af3d94275c0c7f33043b367a2e34fbb899ec33 100644
--- a/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_gpu_memory_buffer_image.txt
+++ b/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_gpu_memory_buffer_image.txt
@@ -31,10 +31,6 @@ New Tokens
 
         READ_WRITE_CHROMIUM 0x78F2
 
-    Accepted by the <param> parameter of GetImageivCHROMIUM:
-
-        GL_GPU_MEMORY_BUFFER_ID 0x78FD
-
 New Procedures and Functions
 
     GLuint CreateGpuMemoryBufferImageCHROMIUM(GLsizei width,
@@ -63,12 +59,6 @@ New Procedures and Functions
     copyTexSubImage2D) will perform paramter validation as if the internal
     format were RGB.
 
-    void GetImageivCHROMIUM(GLuint image_id, GLenum param, GLint* data)
-
-    When the parameter GL_GPU_MEMORY_BUFFER_ID is passed as <param>, returns the
-    id of the GpuMemoryBuffer associated with <image_id>. If the image does not
-    exist, or is not associated with a GpuMemoryBuffer, returns -1.
-
 Errors
 
     None.
@@ -81,4 +71,3 @@ Revision History
 
     9/29/2014   Documented the extension.
     4/12/2016   Added details of OS X RGB workaround.
-    5/25/2016   Added the GetImageivCHROMIUM function.